array_keys() returns the keys, numeric and
string, from the array.
If the optional search_value is specified,
then only the keys for that value are returned. Otherwise, all
the keys from the array are returned.
An array containing keys to return.
If specified, then only keys containing these values are returned.
Determines if strict comparison (===) should be used during the search.
Returns an array of all the keys in array.
Example #1 array_keys() 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));
?>
The above example will output:
Array
(
[0] => 0
[1] => color
)
Array
(
[0] => 0
[1] => 3
[2] => 4
)
Array
(
[0] => color
[1] => size
)
| Version | Description |
|---|---|
| 5.0.0 |
Added the strict parameter.
|
