array_intersect_key

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

array_intersect_key — Computes the intersection of arrays using keys for comparison

Descrizione

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

array_intersect_key() returns an array containing all the entries of array which have keys that are present in all the arguments.

Elenco dei parametri

array: The array with master keys to check.
arrays: Arrays to compare keys against.

Valori restituiti

Returns an associative array containing all the entries of array which have keys that are present in all arguments.

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_intersect_key() example

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

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

Il precedente esempio visualizzerà:

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 array.

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.

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_key() - Computes the difference of arrays using keys for comparison
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_ukey() - Computes the intersection of arrays using a callback function on the keys for comparison