PHP Manual: array_intersect_assoc

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(PHP 4 >= 4.3.0, PHP 5)

array_intersect_assoc -- Computes the intersection of arrays with additional index check


array array_intersect_assoc ( array array1, array array2 [, array ...] )

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().

Example 1. array_intersect_assoc() example

= array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result_array = array_intersect_assoc($array1, $array2);

The above example will output:

    [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 its key is 0 while the key of "red" in $array2 is 1.

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

See also array_intersect(), array_uintersect_assoc(), array_intersect_uassoc(), array_uintersect_uassoc(), array_diff() and array_diff_assoc().