key
Name
key — Returns the key for the element in the current
position.
Synopsis
mixed key
(array);
array array: Array from
which to return the current key
Returns
Key of the current array element; FALSE on error
Description
key() is used to retrieve the key of the element
to which the internal array pointer is currently set.
Example
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));
Output:
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
http://www.opencontent.org/openpub/).
The authors of this book have elected not to choose any options under the OPL. This online book was obtained
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and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4
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