array_intersect_key

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

array_intersect_keyComputes 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.

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