array_intersect_assoc

Description

array_intersect_assoc() returns an array containing all the values of array1 that are present in all the arguments. Note that the keys are used in the comparison unlike in array_intersect().

範例 1. array_intersect_assoc() example <?php $array1 = array ("a" => "green", "b" => "brown", "c" => "blue", "red"); $array2 = array ("a" => "green", "yellow", "red"); $result_array = array_intersect_assoc ($array1, $array2); /* $result_array will look like: Array ( [a] => green ) */ ?>

In our example you see that only the pair "a" => "green" is present in both arrays and thus is returned. The value "red" is not returned because in $array1 it's key is 2 while the key of "red" in $array2 it is 1.

The two values from the key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In otherwords a strict type check is executed so the string representation must be the same.

See also array_diff() and array_intersect().