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PHP 7.x — P3: Variables Intro
The best way to introduce variables is to start thinking about math. You might remember that there are these things called x and y variables that used to store numbers.
If x = 2 and y = 5 then what is x + y? Just substitute 2 for x and 5 for y and you get 7.
Variables are just storage containers. You can store any data type that you would like inside of them; we’ll look at strings and integers below.
In PHP, variables start with a dollar sign, followed by either the underscore or a letter, followed by a series of letters, numbers, and/or underscores. Let’s look at some examples of valid PHP variable names.
<?php
// Valid PHP variable names
$x = 1;
$X = 2; # different from $x
$_x = 2;
$__y = 3;
$_z_ = "Hello";
$__name__ = "Dino";
$dino1 = "First Dino";
$dino_1 = "Dino 1";
$_dino_1 = "He was number 1";
$d1_2_3_hello_ = "Still valid";
// Invalid PHP variable names
$1 = "Number 1";
$%abc = "Invalid"; // Really, any special character
?>
As a regular expression, the valid syntax for PHP variables is stated as:
^[a-zA-Z_\x80-\xff][a-zA-Z0-9_\x80-\xff]*$
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What is GEEK
Buddha Community
1665369120
CellularAutomata.jl: Cellular Automata Simulation toolkit for Julia
Cellular Automata
A cellular automaton is a collection of "colored" cells on a grid of specified shape that evolves through a number of discrete time steps according to a set of rules based on the states of neighboring cells. The rules are then applied iteratively for as many time steps as desired.
mathworld.wolfram.com/CellularAutomaton
Elementary CA
To generate an elementary cellular automaton, use
ca = CellularAutomaton(rule, init, gen)
where rule is the Wolfram code (integer), init is a vector containing the initial starting condition and gen is the number of generations to be computed. For a single starting cell in the middle just omit the init vector.
To generate 15 generations of elementary cellular automaton of rule 90 use
using CellularAutomata
ca90 = CellularAutomaton(90, 16)
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Totalistic CA
For a more complex cellular automaton you can change the number of states k the cell can be and the radius r of neighbors that can influence the states. If k is changed to be larger than 2, a totalistic CA is computed where only the average value of all neighbors count. This can be done like this
ca = CellularAutomaton(993, 15, k=3)
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2 dimensional CAs
Two dimensional cellular automaton (like Conway's Game of Life) can be created by
ca = CA2d(B, S, init, gen)
where B and S are vectors that have the numbers of neighboring cells that define when cell is born or survives, init (matrix) is the initial starting condition and gen is the number of generations the CA is to be computed.
Game of life is then run for 9 generations for e.g. a turbine pattern by typing
ca = CA2d([3], [2, 3], init, 9)
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Running Tests
To run tests, execute the following command from the root folder of the repository:
julia tests/run_tests.jlDownload Details:
Author: Natj
Source Code: https://github.com/natj/CellularAutomata.jl
License: MIT license
1597820991
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1626841560
Variables in PHP - PHP for Beginners - PHP Programming
Hi guys, welcome to my PHP course for beginners in 2020.
Do you want to learn PHP from scratch? In this course, I will be going through all the basics of PHP. I will show you how you could use PHP in HTML code, what variables and data types are, all the different type of operators, control structures, user functions and built in functions and what the super globals are and how you could use them.
After learning all the basics topics, I want to focus on databases using MySQL because we will be creating a login system after.
In this episode, I want to focus on variables. Variables are used to store data such as a name, age and so on. In PHP, variables do not need to be declared before adding a value to it. PHP will automatically convert the variable to the correct data type
#php #php programming #beginners #variables in php
1617276472
Hire PHP Developer - Best PHP Web Frameworks for Web Development
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Want to use PHP Web Frameworks for your web applications?
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