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PHP Functions Online


array_key_exists

(PHP 4 >= 4.0.7, PHP 5)

array_key_existsChecks if the given key or index exists in the array

bool array_key_exists(mixed $key , array $array)

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Preview #

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Description #

bool array_key_exists ( mixed $key , array $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.

Parameters #

key

Value to check.

array

An array with keys to check.

Return Values #

Returns TRUE on success or FALSE on failure.

Examples #

Example #1 array_key_exists() example

<?php
$search_array 
= array('first' => 1'second' => 4);
if (
array_key_exists('first'$search_array)) {
    echo 
"The 'first' element is in the array";
}
?>

Notes #

Note:

For backward compatibility, the following deprecated alias may be used: key_exists()

Note:

For backward compatibility reasons, array_key_exists() will also return TRUE if key is a property defined within an object given as array. This behaviour should not be relied upon, and care should be taken to ensure that array is an array.

To check whether a property exists in an object, use property_exists().

See Also #