array_keys

array_keys

Return all the keys or a subset of the keys of an array

array **array_keys** array $array

array **array_keys** array $array mixed $filter_value bool $strict

returns the keys, numeric and

string, from the . array_keys``array

If a is specified, then only the keys for that value are returned. Otherwise, all the keys from the are returned. filter_value``array

arrayAn array containing keys to return.

filter_valueIf specified, then only keys containing this value are returned.

strictDetermines if strict comparison (===) should be used during the search.

Returns an array of all the keys in . array

Voorbeeld: example

<?php
$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));

$array = array("blue", "red", "green", "blue", "blue");
print_r(array_keys($array, "blue"));

$array = array("color" => array("blue", "red", "green"),
               "size"  => array("small", "medium", "large"));
print_r(array_keys($array));
?>

Array
(
    [0] => 0
    [1] => color
)
Array
(
    [0] => 0
    [1] => 3
    [2] => 4
)
Array
(
    [0] => color
    [1] => size
)

array_values``array_combine``array_key_exists``array_search