Array Funzioni
PHP Manual

array_diff_key

(PHP 5 >= 5.1.0)

array_diff_keyComputes the difference of arrays using keys for comparison

Descrizione

array array_diff_key ( array $array1 , array $array2 [, array $... ] )

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.

Elenco dei parametri

array1

The array to compare from

array2

An array to compare against

...

More arrays to compare against

Valori restituiti

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

Esempi

Example #1 array_diff_key() example

The two keys from the key => value pairs are considered equal only if (string) $key1 === (string) $key2 . In other words a strict type check is executed so the string representation must be the same.

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

var_dump(array_diff_key($array1$array2));
?>

Il precedente esempio visualizzerĂ :

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_key($array1[0], $array2[0]);.

Vedere anche:


Array Funzioni
PHP Manual