array_keys

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array_keys

(PHP 4 , PHP 5)

array_keys -- Return all the keys of an array

Description

array array_keys ( array input [, mixed search_value])

array_keys() returns the keys, numeric and string, from the input array.

If the optional search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the input are returned.

Exemplu 1. array_keys() example


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

The printout of the program above will be:

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

Notã: This function was added to PHP 4, below is an implementation for those still using PHP 3.
Exemplu 2. Implementation of array_keys() for PHP 3 users
function array_keys ($arr, $term="") { $t = array(); while (list($k,$v) = each($arr)) { if ($term && $v != $term) { continue; } $t[] = $k; } return $t; }

array_keys

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