Descrizione

array_diff_key(array $array, array ...$arrays): array

Compares the keys from array against the keys from arrays 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

array: The array to compare from
arrays: Arrays to compare against

Valori restituiti

Returns an array containing all the entries from array whose keys are absent from all of the other arrays.

Log delle modifiche

Versione Descrizione

8.0.0 This function can now be called with only one parameter. Formerly, at least two parameters have been required.

Versione	Descrizione
8.0.0	This function can now be called with only one parameter. Formerly, at least two parameters have been required.

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, 'yellow' => 7, 'cyan' => 8);

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

Il precedente esempio visualizzerà:

array(3) {
  ["blue"]=>
  int(1)
  ["red"]=>
  int(2)
  ["purple"]=>
  int(4)
}

<?php
$array1 = array('blue' => 1, 'red'  => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'yellow' => 7, 'cyan' => 8);
$array3 = array('blue' => 6, 'yellow' => 7, 'mauve' => 8);

var_dump(array_diff_key($array1, $array2, $array3));
?>

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

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 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_ukey() - Computes the difference of arrays using a callback function on the 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