Last updated: Fri, 18 Jul 2008

array_diff_ukey

(PHP 5 >= 5.1.0)

array_diff_ukey — Computes the difference of arrays using a callback function on the keys for comparison

Descrizione

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

Compares the keys from array1 against the keys from array2 and returns the difference. This function is like array_diff() except the comparison is done on the keys instead of the values.

Unlike array_diff_key() an user supplied callback function is used for the indices comparision, not internal function.

Elenco dei parametri

array1: The array to compare from
array2: An array to compare against
...: More arrays to compare against
key_compare_func: callback function to use. The callback function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.

Valori restituiti

Returns an array containing all the entries from array1 that are not present in any of the other arrays.

Esempi

Example #1 array_diff_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_diff_ukey($array1, $array2, 'key_compare_func'));
?>

Il precedente esempio visualizzerà:

array(2) {
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}

Note

Nota: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_diff_ukey($array1[0], $array2[0], 'callback_func');.

Vedere anche:

add a note User Contributed Notes
array_diff_ukey

jordancdarwin at googlemail dot com
15-Dec-2007 01:41


Note, also that when you are using a callback function you can use the text-placeholders as this function relies on the retval of the function you give.



So, instead of 1,0,-1 you can use TRUE and FALSE if using only two options.



Just thought it may help you

add a note

array_diff

array_diff_uassoc

Last updated: Fri, 18 Jul 2008