(no version information, might be only in CVS)
array_intersect_key -- Computes the intersection of arrays using keys for comparison
Description
array
array_intersect_key ( array array1, array array2 [, array ...] )
array_intersect_key() returns an array
containing all the values of array1
which have matching keys that are present in all the arguments.
Example 1. array_intersect_key() example
<?php
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
var_dump(array_intersect_key($array1, $array2));
?>
|
The above example will output: array(2) {
["blue"]=>
int(1)
["green"]=>
int(3)
}) |
|
In our example you see that only the keys 'blue'
and 'green' are present in both arrays and thus
returned. Also notice that the values for the keys
'blue' and 'green' differ between
the two arrays. A match still occurs because only the keys are checked.
The values returned are those of array1.
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.
See also array_diff(),
array_udiff()
array_diff_assoc(),
array_diff_uassoc(),
array_udiff_assoc(),
array_udiff_uassoc(),
array_diff_key(),
array_diff_ukey(),
array_intersect(),
array_intersect_assoc(),
array_intersect_uassoc() and
array_intersect_ukey().
