array_keys
Return all the keys of an array
&reftitle.description;
arrayarray_keys
arrayinput
mixedsearch_value
boolstrictfalse
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.
As of PHP 5, you can use strict parameter for
comparison including type (===).
&reftitle.parameters;
input
An array containing keys to return.
search_value
If specified, then only keys containing these values are returned.
strict
As of PHP 5, this parameter determines if strict comparison (===)
should be used during the search.
&reftitle.returnvalues;
Returns an array of all the keys in input.
&reftitle.examples;
<function>array_keys</function> example
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));
?>
]]>
&example.outputs;
0
[1] => color
)
Array
(
[0] => 0
[1] => 3
[2] => 4
)
Array
(
[0] => color
[1] => size
)
]]>
&reftitle.seealso;
array_values
array_key_exists