PHP Array_key_exists An implementation method that checks whether the key name or index exists in an array _php instance

Array_key_exists ()

The PHP array_key_exists () function checks whether a given key name or index exists in an array, returns TRUE if it exists, or returns FALSE.

Grammar:

the 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 indexed as an array.

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 exists in array $arr _a ';
} else {
  echo ' key name does not exist in array $arr _a '; c10/>}
?>

The example output is as follows:

The key name name exists in the array $arr _a the array_key_exists () function returns TRUE for an array element that has a value of NULL. To check whether an array element is NULL, use Isset ().

The above PHP array_key_exists check the key name or whether the index exists in the array of the implementation method is small series to share all the content, hope to give you a reference, but also hope that we support cloud habitat community.