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array_intersect_assoc

(PHP 4 >= 4.3.0, PHP 5)

array_intersect_assocComputes the intersection of arrays with additional index check

Description

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().

Parameters

array1

The array with master values to check.

array2

An array to compare values against.

...

A variable list of arrays to compare.

Return Values

Returns an associative array containing all the values in array1 that are present in all of the arguments.

Examples

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.

See Also

PHP Manual