The array_key_exists() is an inbuilt function of PHP and is used to checks if the given key or index exists in the array.
array_key_exists() returns TRUE if the given key is set in the array. key can be any value possible for an array index.
key: Value to check.array: An array with keys to check.
Example #1 array_key_exists() example
1 2 3 4 5 6 | <?php $search_array = array('first' => 1, 'second' => 4); if (array_key_exists('first', $search_array)) { echo "The 'first' element is in the array"; } ?> |
Example #2 array_key_exists() example
1 2 3 4 5 6 7 | <?php $foo = array(); $foo['bar'] = NULL; var_dump(isset($foo['bar'])); var_dump(array_key_exists('bar', $foo)); ?> |
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