(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
array_intersect_assoc — Computes the intersection of arrays with additional index check
$array, array ...$arrays): array
array_intersect_assoc() returns an array
containing all the values of array
that are present in all the arguments. Note that the keys are also used in
the comparison unlike in array_intersect().
arrayThe array with master values to check.
arraysArrays to compare values against.
Returns an associative array containing all the values in
array that are present in all of the arguments.
Example #1 array_intersect_assoc() example
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "b" => "yellow", "blue", "red");
$result_array = array_intersect_assoc($array1, $array2);
print_r($result_array);
?>
The above example will output:
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 its key is 0 while
the key of "red" in $array2 is
1, and the key "b" is not returned
because its values are different in each array.
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.