[edit] Last updated: Fri, 17 May 2013

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 $ ... ], callable $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() a user supplied callback function is used for the indices comparison, 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: La funzione di confronto deve restituire un intero minore, uguale o maggiore di zero se il primo argomento è considerato essere minore, uguale o maggiore del secondo.

int callback ( mixed $a, mixed $b )

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:

array_diff() - Calcola la differenza di due o più array
array_udiff() - Computes the difference of arrays by using a callback function for data comparison
array_diff_assoc() - Calcola la differenza tra due o più array con un ulteriore controllo sull'indice
array_diff_uassoc() - Computes the difference of arrays with additional index check which is performed by a user supplied callback function
array_udiff_assoc() - Computes the difference of arrays with additional index check, compares data by a callback function
array_udiff_uassoc() - Computes the difference of arrays with additional index check, compares data and indexes by a callback function
array_diff_key() - Computes the difference of arrays using keys for comparison
array_intersect() - Calcola l'intersezione degli arrays
array_intersect_assoc() - Calcola l'intersezione degli array con un ulteriore controllo sugli indici
array_intersect_uassoc() - Computes the intersection of arrays with additional index check, compares indexes by a callback function
array_intersect_key() - Computes the intersection of arrays using keys for comparison
array_intersect_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison

add a note User Contributed Notes array_diff_ukey - [1 notes]

down

-2

jordancdarwin at googlemail dot com ¶

5 years ago


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

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