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key — Returns the key for the element in the current position.


mixed key(array);
array array: Array from which to return the current key


Key of the current array element; FALSE on error


key() is used to retrieve the key of the element to which the internal array pointer is currently set.


PHP 3, PHP 4

See also

See also current() , end() , next() , prev() , reset()


Example 48. Fetch the key of the current array element

$my_array = array("x" => "two", "z" => "four", "y" => "three", "w" => "one");
do {
  echo "Key: ", key($my_array), "\n";
} while (each($my_array));

Key: x
Key: z
Key: y
Key: w

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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