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(PHP 5 >= 5.1.0)
array_intersect_key — Ermittelt die Schnittmenge von Arrays, indem es die Schlüssel vergleicht
array_intersect_key() gibt ein Array zurück, welches alle Werte von array1 enthält, die Schlüssel besitzen die in allen anderen Argumente enthalten sind.
Beispiel #1 array_intersect_key() Beispiel
<?php
$array1 = array('blau' => 1, 'rot' => 2, 'grün' => 3, 'violett' => 4);
$array2 = array('grün' => 5, 'blau' => 6, 'gelb' => 7, 'türkis' => 8);
var_dump(array_intersect_key($array1, $array2));
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
array(2) {
["blau"]=>
int(1)
["grün"]=>
int(3)
})
In unserem Beispiel sehen Sie, dass nur die Schlüssel 'blau' und 'grün' in beiden Arrays vorhanden sind und daher zurückgegeben werden. 'blue' und 'grün' haben unterschiedliche Werte. Eine Übereinstimmung wird dennoch festgestellt, da nur die Schlüssel geprüft werden. Die zurückgegebenen Werte sind diejenigen aus array1.
Die beiden Schlüssel des Schlüssel => Wert Paares werden als gleich erachtet, genau dann wenn (string) $key1 === (string) $key2 . Anders ausgedrückt findet eine strikte Prüfung statt, in der die String-Repräsentationen gleich sein müssen.
Siehe auch array_diff(), array_udiff() array_diff_assoc(), array_diff_uassoc(), array_udiff_assoc(), array_udiff_uassoc(), array_diff_key(), array_diff_ukey(), array_intersect(), array_intersect_assoc(), array_intersect_uassoc() und array_intersect_ukey().
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