PHP - array_keys

Trieda

Koreň \ Bez triedy

Metóda - array_keys

(PHP 4, PHP 5, PHP 7)

Returns an array of keys from the entered array.

Procedurálne

• function array_keys (array $array, mixed $search_value = null, bool $strict = false) : array

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$array	array		An array containing keys to return.
$search_value	mixed	null	A value what a key should contain in order to be returned.
$strict	bool	false	A comparison of a value can be specified by an optional parameter which when is true a strict comparison (===) will be used.

Mávratovej hodnoty

Vracia: array

An array of keys.

Príklady

<?php
$array = ['Homer' => 'Donut', 'Lisa' => 'Book', 'Bart' => 'Sling'];
$keys = array_keys($array);

print_r($keys);

And an example with a specification of a key value:

<?php
$array = ['Homer' => 'Donut', 'Lisa' => 'Book', 'Bart' => 'Sling', 'Chief Wiggum' => 'Donut'];
$keys = array_keys($array, 'Donut');

print_r($keys);