PHP array_key_exists() is an inbuilt function that checks the array for a specific key and returns true value if key exists and otherwise it return false.
PHP array_key_exists() is an inbuilt function that checks the array for a particular key and returns a true value if the key exists and returns false if the key does not exist. If you skip the key when you define an array, the integer key is generated like an index, starting from 0 and increases by 1 for each value.
PHP array_key_exists() function to test whether a given key or index exists in an array or not. The array_key_exists() function returns TRUE on success or FALSE on failure.
See the following syntax.
The key is the value of the key to be checked.
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