(PHP 4 ) array_keys -- Return all the keys of an array Descriptionarray 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.
Example 1. Array_keys() example
$array = array (0 => 100, "color" => "red"); array_keys ($array); // returns array (0, "color") $array = array ("blue", "red", "green", "blue", "blue"); array_keys ($array, "blue"); // returns array (0, 3, 4) |
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Note: This function was added to PHP 4, below is an implementation for those still using PHP 3. Example 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; } |
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See also array_values(). |
