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PHP is a recursive acronym for PHP Hypertext Preprocessor. It is a widely used open-source programming language especially suited for creating dynamic websites and mobile API’s. So, if you are planning to start your career in PHP and you wish to know the skills related to it, now is the right time to dive in. These **PHP Interview Questions and Answers **are collected after consulting with **PHP Certification Training **experts.
The PHP Interview Questions are divided into 2 sections:
Basic Level PHP Interview QuestionsAdvanced Level PHP Interview Questions
Let’s begin with the first section of PHP interview questions.
PEAR is a framework and repository for reusable PHP components. PEAR stands for PHP Extension and Application Repository. It contains all types of PHP code snippets and libraries. It also provides a command line interface to install “packages” automatically.
Q3. What is the difference between static and dynamic websites?
To execute a PHP script, use the PHP Command Line Interface (CLI) and specify the file name of the script in the following way:
php script.php
PHP is partially case sensitive. The variable names are case-sensitive but function names are not. If you define the function name in lowercase and call them in uppercase, it will still work. User-defined functions are not case sensitive but the rest of the language is case-sensitive.
The PHP parsing engine needs a way to differentiate PHP code from other elements in the page. The mechanism for doing so is known as ‘escaping to PHP’. Escaping a string means to reduce ambiguity in quotes used in that string.
Some of the important characteristics of PHP variables include:
All variables in PHP are denoted with a leading dollar sign ($).The value of a variable is the value of its most recent assignment.Variables are assigned with the = operator, with the variable on the left-hand side and the expression to be evaluated on the right.Variables can, but do not need, to be declared before assignment.Variables in PHP do not have intrinsic types – a variable does not know in advance whether it will be used to store a number or a string of characters.Variables used before they are assigned have default values.### Q8. What are the different types of PHP variables?
There are 8 data types in PHP which are used to construct the variables:
Integers − are whole numbers, without a decimal point, like 4195.Doubles − are floating-point numbers, like 3.14159 or 49.1.Booleans − have only two possible values either true or false.NULL − is a special type that only has one value: NULL.Strings − are sequences of characters, like ‘PHP supports string operations.’Arrays − are named and indexed collections of other values.Objects − are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class.Resources − are special variables that hold references to resources external to PHP.### Q9. What are the rules for naming a PHP variable?
The following rules are needed to be followed while naming a PHP variable:
Variable names must begin with a letter or underscore character.A variable name can consist of numbers, letters, underscores but you cannot use characters like + , – , % , ( , ) . & , etc.### Q10. What are the rules to determine the “truth” of any value which is not already of the Boolean type?
The rules to determine the “truth” of any value which is not already of the Boolean type are:
If the value is a number, it is false if exactly equal to zero and true otherwise.If the value is a string, it is false if the string is empty (has zero characters) or is the string “0”, and is true otherwise.Values of type NULL are always false.If the value is an array, it is false if it contains no other values, and it is true otherwise. For an object, containing a value means having a member variable that has been assigned a value.Valid resources are true (although some functions that return resources when they are successful will return FALSE when unsuccessful).Don’t use double as Booleans.### Q11. What is NULL?
NULL is a special data type which can have only one value. A variable of data type NULL is a variable that has no value assigned to it. It can be assigned as follows:
$var = NULL;
The special constant NULL is capitalized by convention but actually it is case insensitive. So,you can also write it as :
$var = null;
A variable that has been assigned the NULL value, consists of the following properties:
It evaluates to FALSE in a Boolean context.It returns FALSE when tested with IsSet() function.### Q12. How do you define a constant in PHP?
To define a constant you have to use define() function and to retrieve the value of a constant, you have to simply specifying its name.If you have defined a constant, it can never be changed or undefined. There is no need to have a constant with a $. A valid constant name starts with a letter or underscore.
The constant() function will return the value of the constant. This is useful when you want to retrieve value of a constant, but you do not know its name, i.e., it is stored in a variable or returned by a function. For example –
<?php
define("MINSIZE", 50);
echo MINSIZE;
echo constant("MINSIZE"); // same thing as the previous line
?>
Break – It terminates the for loop or switch statement and transfers execution to the statement immediately following the for loop or switch.
Continue – It causes the loop to skip the remainder of its body and immediately retest its condition prior to reiterating.
The two most common ways to start and** finish** a PHP block of code are:
<?php [ --- PHP code---- ] ?>
<? [--- PHP code ---] ?>
The **final **keyword in a method declaration indicates that the method cannot be overridden by subclasses. A class that is declared final cannot be subclassed. This is particularly useful when we are creating an immutable class like the String class.Properties cannot be declared final, only classes and methods may be declared as final.
We use the operator ‘==’ to test if two objects are** instanced** from the same class and have same attributes and equal values. We can also test if two objects are referring to the same instance of the same class by the use of the identity operator ‘===’.
PHP and Javascript cannot directly interact since PHP is a server side language and Javascript is a client-side language. However, we can exchange variables since PHP can generate Javascript code to be executed by the browser and it is possible to pass specific variables back to PHP via the URL.
It is possible to generate HTML through PHP scripts, and it is possible to pass pieces of information from HTML to PHP. PHP is a server side language and HTML is a client side language so PHP executes on server side and gets its results as strings, arrays, objects and then we use them to display its values in HTML.
Some of the popular frameworks in PHP are:
PHP support 9 primitive data types:
PHP constructor and destructor are special type functions which are automatically called when a PHP class object is created and destroyed. The constructor is the most useful of the two because it allows you to send parameters along when creating a new object, which can then be used to initialize variables on the object.
Here is an example of constructor and destructor in PHP:
<?php
class Foo {
private $name;
private $link;
public function __construct($name) {
$this->;name = $name;
}
public function setLink(Foo $link){
$this->;link = $link;
}
public function __destruct() {
echo 'Destroying: ', $this->name, PHP_EOL;
}
}
?>
The Include() function is used to put data of one PHP file into another PHP file. If errors occur then the include() function produces a warning but does not stop the execution of the script and it will continue to execute.
The Require() function is also used to put data of one PHP file to another PHP file. If there are any errors then the require() function produces a warning and a fatal error and stops the execution of the script.
The require() includes and evaluates a specific file, while require_once() does that only if it has not been included before. The require_once() statement can be used to include a php file in another one, when you may need to include the called file more than once. So, require_once() is recommended to use when you want to include a file where you have a lot of functions.
The different types of error in PHP are:
E_ERROR– A fatal error that causes script termination.E_WARNING– Run-time warning that does not cause script termination.E_PARSE– Compile time parse error.E_NOTICE– Run time notice caused due to error in code.E_CORE_ERROR– Fatal errors that occur during PHP initial startup.E_CORE_WARNING– Warnings that occur during PHP initial startup.E_COMPILE_ERROR– Fatal compile-time errors indication problem with script.E_USER_ERROR– User-generated error message.E_USER_WARNING– User-generated warning message.E_USER_NOTICE- User-generated notice message.E_STRICT– Run-time notices.E_RECOVERABLE_ERROR– Catchable fatal error indicating a dangerous errorE_ALL– Catches all errors and warnings.### Q29. Explain the syntax for ‘foreach’ loop with example.
The foreach statement is used to loop through arrays. For each pass the value of the current array element is assigned to $value and the array pointer is moved by one and in the next pass next element will be processed.
Syntax-
foreach (array as value)
{
code to be executed;
}
Example
<?php
$colors = array("blue", "white", "black");
foreach ($colors as $value) {
echo "$value <br>";
}
?>
There are 3 types of Arrays in PHP:
Indexed Array – An array with a numeric index is known as the indexed array. Values are stored and accessed in linear fashion.Associative Array – An array with strings as index is known as the associative array. This stores element values in association with key values rather than in a strict linear index order.Multidimensional Array – An array containing one or more arrays is known as multidimensional array. The values are accessed using multiple indices.### Q31. What is the difference between single quoted string and double quoted string?
Singly quoted strings are treated almost literally, whereas doubly quoted strings replace variables with their values as well as specially interpreting certain character sequences. For example
<?php
$variable = "name";
$statement = 'My $variable will not print!n';
print($statement);
print "<br/>;"
$statement = "My $variable will print!n"
print($statement);
?>
It will give the following output–
My $variable will not print!
My name will print
To concatenate two string variables together, we use the dot (.) operator.
<?php
$string1="Hello edureka";
$string2="123";
echo $string1 . " " . $string2;
?>
This will produce following result −
Hello edureka 123
The set_time_limit(0) added at the beginning of a script sets to infinite the time of execution to not have the PHP error ‘maximum execution time exceeded.’ It is also possible to specify this in the php.ini file.
PHP echo output one or more string. It is a language construct not a function. So use of parentheses is not required. But if you want to pass more than one parameter to echo, use of parentheses is required. Whereas, PHP print output a string. It is a language construct not a function. So use of parentheses is not required with the argument list. Unlike echo, it always returns 1.Echo can output one or more string but print can only output one string and always returns 1.Echo is faster than print because it does not return any value.### Q35. Name some of the functions in PHP.
Some of the functions in PHP include:
ereg() – The ereg() function searches a string specified by string for a string specified by pattern, returning true if the pattern is found, and false otherwise.ereg() – The ereg() function searches a string specified by string for a string specified by pattern, returning true if the pattern is found, and false otherwise.split() – The split() function will divide a string into various elements, the boundaries of each element based on the occurrence of pattern in string.preg_match() – The preg_match() function searches string for pattern, returning true if pattern exists, and false otherwise.preg_split() – The preg_split() function operates exactly like split(), except that regular expressions are accepted as input parameters for pattern.
These were some of the most commonly asked basic level PHP interview questions. Let’s move on to the next section of advanced level PHP interview questions.
PHP is a programming language whereas ASP.NET is a programming** framework**. Websites developed by ASP.NET may use C#, but also other languages such as J#. ASP.NET is compiled whereas PHP is interpreted. ASP.NET is designed for windows machines, whereas PHP is platform free and typically runs on Linux servers.
A session is a global variable stored on the server. Each session is assigned a unique id which is used to retrieve stored values. Sessions have the capacity to store relatively large data compared to cookies. The session values are automatically deleted when the browser is closed.
Following example shows how to** create a cookie** in PHP
<?php
$cookie_value = "edureka";
setcookie("edureka", $cookie_value, time()+3600, "/your_usename/", "edureka.co", 1, 1);
if (isset($_COOKIE['cookie']))
echo $_COOKIE["edureka"];
?>
Following example shows how to start a session in PHP
<?php
session_start();
if( isset( $_SESSION['counter'] ) ) {
$_SESSION['counter'] += 1;
}else {
$_SESSION['counter'] = 1;
}
$msg = "You have visited this page". $_SESSION['counter'];
$msg .= "in this session.";
?>
Overloading is defining functions that have similar signatures, yet have different parameters. Overriding is only pertinent to derived classes, where the parent class has defined a method and the derived class wishes to override that method. In PHP, you can only overload methods using the magic method __call.
Q40. What is the difference between $message and $$message in PHP?
They are both variables. But $message is a variable with a fixed name. $$message is a variable whose name is stored in $message. For example, if $message contains “var”, $$message is the same as $var.
The basic steps to create MySQL database using PHP are:
Establish a connection to MySQL server from your PHP script.If the connection is successful, write a SQL query to create a database and store it in a string variable.Execute the query.### Q42. What is GET and POST method in PHP?
The GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the ? character. For example
http://www.test.com/index.htm?name1=value1&name2=value2
The POST method transfers information via HTTP headers. The information is encoded as described in case of GET method and put into a header called QUERY_STRING.
PHP callback are functions that may be called dynamically by PHP. They are used by native functions such as array_map, usort, preg_replace_callback, etc. A callback function is a function that you create yourself, then pass to another function as an argument. Once it has access to your callback function, the receiving function can then call it whenever it needs to.
Here is a basic example of callback function
<?php
function thisFuncTakesACallback($callbackFunc)
{
echo "I'm going to call $callbackFunc!<br />";
$callbackFunc();
}
function thisFuncGetsCalled()
{
echo "I'm a callback function!<br />";
}
thisFuncTakesACallback( 'thisFuncGetsCalled' );
?>
A lambda function is an anonymous PHP function that can be stored in a variable and passed as an argument to other functions or methods. A closure is a lambda function that is aware of its surrounding context. For example
$input = array(1, 2, 3, 4, 5);
$output = array_filter($input, function ($v) { return $v > 2; });
unction ($v) { return $v > 2; } is the lambda function definition. We can store it in a variable so that it can be reusable.
In PHP all functions starting with __ names are magical functions/methods. These methods, identified by a two underscore prefix (__), function as interceptors that are automatically called when certain conditions are met. PHP provides a number of ‘magic‘ methods that allow you to do some pretty neat tricks in object oriented programming.
Here are list of** Magic Functions** available in PHP
The crypt () function is used to create one way encryption. It takes one input string and one optional parameter. The function is defined as: crypt (inputstring, salt), where inputstring consists of the string that has to be encrypted and salt is an optional parameter. PHP uses DES for encryption. The format is as follows:
<?php
$password = crypt('edureka');
print $password. "is the encrypted version of edureka";
?>
PHP provides a library called cURL that may already be included in the installation of PHP by default. cURL stands for client URL, and it allows you to connect to a URL and retrieve information from that page such as the HTML content of the page, the HTTP headers and their associated data.
Type hinting is used to specify the expected data type of an argument in a function declaration. When you call the function, PHP will check whether or not the arguments are of the specified type. If not, the run-time will raise an error and execution will be halted.
Here is an example of type hinting
<?php
function sendEmail (Email $email)
{
$email->send();
}
?>
The example shows how to send Email function argument $email Type hinted of Email Class. It means to call this function you must have to pass an email object otherwise an error is generated.
An exception that occurs at compile time is called a checked exception. This exception cannot be ignored and must be handled carefully. For example, if you use FileReader class to read data from the file and the file specified in class constructor does not exist, then a FileNotFoundException occurs and you will have to manage that exception. For the purpose, you will have to write the code in a try-catch block and handle the exception. On the other hand, an exception that occurs at runtime is called unchecked-exception.
With this, we have come to the end of PHP interview questions blog. I Hope these PHP Interview Questions will help you in your interviews. In case you have attended any PHP interview in the recent past, do paste those interview questions in the comments section and we’ll answer them. You can also comment below if you have any questions in your mind, which you might face in your PHP interview.
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Android Interview Questions and Answers from Beginner to Advanced level
DataFlair is committed to provide you all the resources to make you an android professional. We started with android tutorials along with practicals, then we published Real-time android projects along with source code. Now, we come up with frequently asked android interview questions, which will help you in showing expertise in your next interview.
Android – one of the hottest technologies, which is having a bright future. Get ready to crack your next interview with the following android interview questions. These interview questions start with basic and cover deep concepts along with advanced topics.
1. What is Android?
Android is an open-source mobile operating system that is based on the modified versions of Linux kernel. Though it was mainly designed for smartphones, now it is being used for Tablets, Televisions, Smartwatches, and other Android wearables.
2. Who is the inventor of Android Technology?
The inventors of Android Technology are- Andry Rubin, Nick Sears, and Rich Miner.
3. What is the latest version of Android?
The latest version of Android is Android 10.0, known as Android Q. The upcoming major Android release is Android 11, which is the 18th version of Android. [Note: Keep checking the versions, it is as of June 2020.]
4. How many Android versions can you recall right now?
Till now, there are 17 versions of Android, which have their names in alphabetical order. The 18th version of Android is also going to come later this year. The versions of Android are here:
5. Explain the Android Architecture with its components.
This is a popular android developer interview question
Android Architecture consists of 5 components that are-
a. Linux Kernel: It is the foundation of the Android Architecture that resides at the lowest level. It provides the level of abstraction for hardware devices and upper layer components. Linux Kernel also provides various important hardware drivers that act as software interfaces for hardwares like camera, bluetooth, etc.
b. Native Libraries: These are the libraries for Android that are written in C/C++. These libraries are useful to build many core services like ART and HAL. It provides support for core features.
c. Android Runtime: It is an Android Runtime Environment. Android Operating System uses it during the execution of the app. It performs the translation of the application bytecode into the native instructions. The runtime environment of the device then executes these native instructions.
d. Application Framework: Application Framework provides many java classes and interfaces for app development. And it also provides various high-level services. This complete Application framework makes use of Java.
e. Applications: This is the topmost layer of Android Architecture. It provides applications for the end-user, so they can use the android device and compute the tasks.
6. What are the services that the Application framework provides?
The Android application framework has the following key services-
a. Activity Manager: It uses testing and debugging methods.
b. Content provider: It provides the data from application to other layers.
c. Resource Manager: This provides users access to resources.
d. Notification Manager: This gives notification to the users regarding actions taking place in the background.
e. View System: It is the base class for widgets, and it is also responsible for event handling.
7. What are the important features of Linux Kernel?
The important features of the Linux Kernel are as follows:
a. Power Management: Linux Kernel does power management to enhance and improve the battery life of the device.
b. Memory Management: It is useful for the maximum utilization of the available memory of the device.
c. Device Management: It includes managing all the hardware device drivers. It maximizes the utilization of the available resources.
d. Security: It ensures that no application has any such permission that it affects any other application in order to maintain security.
e. Multi-tasking: Multi-tasking provides the users the ease of doing multiple tasks at the same time.
8. What are the building blocks of an Android Application?
This is a popular android interview question for freshers.
The main components of any Android application are- Activity, Services, Content Provider, and Broadcast Receiver. You can understand them as follows:
a. Activity- It is a class that acts as the entry point representing a single screen to the user. It is like a window to show the user interface.
b. Services- Services are the longest-running component that runs in the background.
c. Content Provider- The content provider is an essential component that allows apps to share data between themselves.
d. Broadcast receivers- Broadcast receiver is another most crucial application component. It helps the apps to receive and respond to broadcast messages from the system or some other application.
9. What are the important components of Android Application?
The Components of Android application are listed below:
10. What are the widgets?
Widgets are the variations of Broadcast receivers. They are an important part of home screen customization. They often display some data and also allow users to perform actions on them. Mostly they display the app icon on the screen.
11. Can you name some types of widgets?
Mentioned below are the types of widgets-
a. Informative Widgets: These widgets show some important information. Like, the clock widget or a weather widget.
b. Collective Widgets: They are the collection of some types of elements. For example, a music widget that lets us change, skip, or forward the song.
c. Control Widgets: These widgets help us control the actions within the application through it. Like an email widget that helps check the recent mails.
d. Hybrid Widgets: Hybrid widgets are those that consist of at least two or more types of widgets.
12. What are Intents?
Intents are an important part of Android Applications. They enable communication between components of the same application as well as separate applications. The Intent signals the Android system about a certain event that has occurred.
13. Explain the types of intents briefly?
Intent is of three types that are-
a. Implicit Intents: Implicit intents are those in which there is no description of the component name but only the action.
b. Explicit Intents: In explicit intents, the target component is present by declaring the name of the component.
c. Pending Intents: These are those intents that act as a shield over the Intent objects. It covers the intent objects and grants permission to the external app components to access them.
14. What is a View?
A view is an important building block that helps in designing the user interface of the application. It can be a rectangular box or a circular shape, for example, Text View, Edit Text, Buttons, etc. Views occupy a certain area of the screen, and it is also responsible for event handling. A view is the superclass of all the graphical user interface components.
15. What do you understand by View Group?
It is the subclass of the ViewClass. It gives an invisible container to hold layouts or views. You can understand view groups as special views that are capable of holding other views, that are Child View.
16. What do you understand about Shared Preferences?
It is a simple mechanism for data storage in Android. In this, there is no need to create files, and using APIs, it stores the data in XML files. It stores the data in the pair of key-values. SharedPreferences class lets the user save the values and retrieve them when required. Using SharedPreferences we can save primitive data like- boolean, float, integer, string and long.
17. What is a Notification?
A notification is just like a message that shows up outside the Application UI to provide reminders to the users. They remind the user about a message received, or some other timely information from the app.
18. Give names of Notification types.
There are three types of notifications namely-
a. Toast Notification- This notification is the one that fades away sometime after it pops up.
b. Status Notification- This notification stays till the user takes some action on it.
c. Dialog Notification- This notification is the result of an Active Activity.
19. What are fragments?
A fragment is a part of the complete user interface. These are present in Activity, and an activity can have one or more fragments at the same time. We can reuse a fragment in multiple activities as well.
20. What are the types of fragments?
There are three types of fragments that are: Single Fragment, List Fragment, Fragment Transactions.
21. What are Layout XML files?
Layout XML files contain the structure for the user interface of the application. The XML file also contains various different layouts and views, and they also specify various GUI components that are there in Activity or fragments.
22. What are Resources in Android Application?
The resources in Android Apps defines images, texts, strings, colors, etc. Everything in resources directory is referenced in the source code of the app so that we can use them.
23. Can you develop Android Apps with languages other than Java? If so, name some.
Yes, there are many languages that we can work with, for the development of Android Applications. To name some, I would say Java, Python, C, C++, Kotlin, C#, Corona/LUA.
24. What are the states of the Activity Lifecycle?
Activity lifecycle has the following four stages-
a. Running State: As soon as the activity starts, it is the first state.
b. Paused State: When some other activity starts without closing the previous one, the running activity turns into the Paused state.
c. Resume State: When the activity opens again after being in pause state, it comes into the Resume State.
d. Stopped State: When the user closes the application or stops using it, the activity goes to the Stopped state.
25. What are some methods of Activity?
The methods of Activity are as follows:
26. How can you launch an activity in Android?
We launch an activity using Intents. For this we need to use intent as follows:
27. What is the service lifecycle?
There are two states of a service that are-
a. Started State: This is when the service starts its execution. A Services come in start state only through the startService() method.
b. Bounded State: A service is in the bounded state when it calls the method bindService().
28. What are some methods of Services?
The methods of service are as follows-
29. What are the types of Broadcast?
Broadcasts are of two types that are-
a. Ordered Broadcast: Ordered broadcasts are Synchronous and work in a proper order. It decides the order by using the priority assigned to the broadcasts.
b. Normal Broadcast: These are asynchronous and unordered. They are more efficient as they run unorderly and all at once. But, they lack full utilization of the results.
30. What are useful impotent folders in Android?
The impotent folders in an Android application are-
31. What are the important files for Android Application when working on Android Studio?
This is an important android studio interview question
There are following three files that we need to work on for an application to work-
a. The AndroidManifest.xml file: It has all the information about the application.
b. The MainActivity.java file: It is the app file that actually gets converted to the dalvik executable and runs the application. It is written in java.
c. The Activity_main.xml file: It is the layout file that is available in the res/layout directory. It is another mostly used file while developing the application.
32. Which database do you use for Android Application development?
The database that we use for Android Applications is SQLite. It is because SQLite is lightweight and specially developed for Android Apps. SQLite works the same way as SQL using the same commands.
33. Tell us some features of Android OS.
The best features of Android include-
34. Why did you learn Android development?
Learning Android Studio is a good idea because of the following-
35. What are the different ways of storage supported in Android?
The various storage ways supported in Android are as follows:
36. What are layouts?
Layout is nothing but arrangements of elements on the device screen. These elements can be images, tests, videos, anything. They basically define the structure of the Android user interface to make it user friendly.
37. How many layout types are there?
The type of layouts used in Android Apps are as follows:
38. What is an APK?
An APK stands for Android Package that is a file format of Android Applications. Android OS uses this package for the distribution and installation of the Android Application.
39. What is an Android Manifest file?
The manifest file describes all the essential information about the project application for build tools, Android operating system, and google play. This file is a must for every Android project that we develop, and it is present in the root of the project source set.
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A framework that can drastically cut down the requirement to write original code to develop the web apps as per your requirement is PHP Framework. PHP frameworks offer code libraries for commonly used functions to reduce the development time.
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One programming language that has its root in Website development even at present is PHP Website Development. The PHP programming is executed on the server side which means it functions on web servers which helps the website in its performance.
Want to develop a website on PHP?
WebClues Infotech with its years of experience in Web Development helps individuals and businesses in launching a business website on PHP. The experienced development team with more than 20 years of experience is the solution to your every web development needs.
Want to know more about PHP website development?
Visit: https://www.webcluesinfotech.com/php-web-development/
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