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array_diff_key
Computes the difference of arrays using keys for comparison
(PHP 5 >= 5.1.0)
array array_diff_key ( array array1, array array2 [, array ...] )
Compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.
Parameters
- array1
The array to compare from
- array2
An array to compare against
- ...
More arrays to compare against
Return Values
Returns an array containing all the entries from array1 that are not present in any of the other arrays.
Examples
Example 239. array_diff_key() example
The two keys from the key => value pairs are
considered equal only if
(string) $key1 === (string) $key2 . In other words
a strict type check is executed so the string representation must be
the same.
<?php
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
var_dump(array_diff_key($array1, $array2));
?>The above example will output:
array(2) {
["red"]=>
int(2)
["purple"]=>
int(4)
}