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Array Functions
PHP Manual

array_intersect_ukey

(PHP 5 >= 5.1.0)

array_intersect_ukeyComputes the intersection of arrays using a callback function on the keys for comparison

Description

array array_intersect_ukey ( array $array1 , array $array2 [, array $... ], callback $key_compare_func )

array_intersect_ukey() returns an array containing all the values of array1 which have matching keys that are present in all the arguments.

This comparison is done by a user supplied callback function. It must return an integer less than, equal to, or greater than zero if the first key is considered to be respectively less than, equal to, or greater than the second.

Parameters

array1

Initial array for comparison of the arrays.

array2

First array to compare keys against.

array

Variable list of array arguments to compare keys against.

key_compare_func

User supplied callback function to do the comparison.

Return Values

Returns the values of array1 whose keys exist in all the arguments.

Examples

Example #1 array_intersect_ukey() example

<?php
function key_compare_func($key1$key2)
{
    if (
$key1 == $key2)
        return 
0;
    else if (
$key1 $key2)
        return 
1;
    else
        return -
1;
}

$array1 = array('blue'  => 1'red'  => 2'green'  => 3'purple' => 4);
$array2 = array('green' => 5'blue' => 6'yellow' => 7'cyan'   => 8);

var_dump(array_intersect_ukey($array1$array2'key_compare_func'));
?>

The above example will output:

array(2) {
  ["blue"]=>
  int(1)
  ["green"]=>
  int(3)
}

In our example you see that only the keys 'blue' and 'green' are present in both arrays and thus returned. Also notice that the values for the keys 'blue' and 'green' differ between the two arrays. A match still occurs because only the keys are checked. The values returned are those of array1 .

See Also


Array Functions
PHP Manual

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