PHP: array_intersect_assoc

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().

Příklad 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 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 otherwords a strict type check is executed so the string representation must be the same.

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array_intersect_assoc

nleippe at integr8ted dot com
12-Feb-2004 01:46


A combination of the two functions [array_intersect() and array_intersect_assoc()] in order to obtain the intersection of two multidimensional arrays.





<?php


function array_intersect_assoc_recursive(&$arr1, &$arr2) {


    if (!is_array($arr1) || !is_array($arr2)) {


        return $arr1 == $arr2; // or === for strict type


    }


    $commonkeys = array_intersect(array_keys($arr1), array_keys($arr2));


    $ret = array();


    foreach ($commonkeys as $key) {


        $ret[$key] =& array_intersect_assoc_recursive($arr1[$key], $arr2[$key]);


    }


    return $ret;


}


?>

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