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PHP - Function array_keys()
Syntax
array_keys ( $input [, $search_value [, $strict]] );
Definition and Usage
It returns the keys, numeric and string, from the input array.
Parameters
| Sr.No | Parameter & Description |
|---|---|
| 1 |
input(Required) It specifies an array. |
| 2 | search_value(Required) You can specify a value, then only the keys with this value are returned. |
| 3 | strict Optional. Used with the value parameter. |
Return Values
It returns the keys, numeric and string, from the input array
Example
Try out following example −
<?php
$input = array("a"=>"Monkey","b"=>"Cat","c"=>"Dog");
print_r(array_keys($input));
$input = array("a"=>"Monkey","b"=>"Cat","c"=>"Dog");
print_r(array_keys($input,"Dog"));
$input = array(10,20,30,"10");
print_r(array_keys($input,"10",false));
?>
This will produce the following result −
Array ( [0] => a [1] => b [2] => c ) Array ( [0] => c ) Array ( [0] => 0 [1] => 3 )
php_function_reference.htm
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