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array_keys
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array_keys

Name

array_keys — Returns all valid keys for the given array.

Synopsis

array array_keys(array); array array: Indexed or associative array

Returns

Indexed array of keys; NULL on failure

Description

Retrieves all the keys from an array and returns them as an indexed array.

Version

PHP 4

Version

Existing since version 4.0

Example

Example 21. Get the keys from arrays

$hash1 = array("lions", "tigers", "bears", "oh my");
$hash2 = array("r" => "red", "g" => "green", "b" => "blue");
echo "Keys for \$hash1: ", implode(", ", array_keys($hash1)), "\n";
echo "Keys for \$hash2: ", implode(", ", array_keys($hash2));

Output:
Keys for $hash1: 0, 1, 2, 3
Keys for $hash2: r, g, b

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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 from http://www.fooassociates.com/phpfer/ 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.