PHP: key() function
PHP: Fetch a key from an array
The key() function is used to get the index element of the current array position.
Version:
(PHP 4 and above)
Syntax:
key(array_name)
Parameter:
| Name | Description | Required / Optional |
Type |
|---|---|---|---|
| array_name | Array to use. | Required | Array |
Return value:
The key of the current array element
Value Type : Mixed*.
*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.
Example:
<?php
$subjects = array("Subject1" => "Physics", "Subject2" => "Chemistry", "Subject3" => "Biology");
echo "Current position Key is : " . key($subjects);
?>
Output:
Current position Key is: Subject1
Pictorial Presentation:
View the example in the browser
Practice here online:
See also
PHP: Tips of the Day
PHP: How to define an empty object in PHP?
$x = new stdClass();
stdClass is the default PHP object. stdClass has no properties, methods or parent. It does not support magic methods, and implements no interfaces.
When you cast a scalar or array as Object, you get an instance of stdClass. You can use stdClass whenever you need a generic object instance.
Ref : https://bit.ly/2Q96Wvm
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