(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.
| Version | Description |
|---|---|
| 8.0.0 | This function can now be called with only one parameter. Formerly, at least two parameters have been required. |
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.