PHP array_key_exists implementation method to check whether the key name or index exists in an array

array_key_exists()

The PHP array_key_exists() function is used to check whether the given key name or index exists in the array, and returns TRUE if it exists, otherwise returns FALSE.

grammar:

bool array_key_exists( mixed key, array search ) parameter key is the given key name or index, and can be any value that can be used as an array index.

The array_key_exists() function can also be used for objects.

example:

<?php
$arr_a = array('id' => 1, 'name' => "admin");
if(array_key_exists('name', $arr_a)){
  echo 'Key name name exists in the array $arr_a';
} else {
  echo 'Key name name does not exist in the array $arr_a';
}
?>

The example output results are as follows:

The key name name exists in the array $arr_a The array_key_exists() function still returns TRUE for array elements with a value of null. To check whether the array element is null, use isset().

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