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strtolower — Converts a string to lowercase.


string strtolower(string);
string string:


Lowercase string


strtolower() converts all uppercase alphabetical characters within a string to their lowercase equivalents.


The conversion from uppercase to lowercase is dependent upon the current locale. Use setlocale() to set or query the locale.


PHP 3+, PHP 4+

See also

To alter the case of a string:





Example 1235. Convert a block of text to lowercase

$poem =  <<<_SAIL_
On A Nutty Zephyr Of Gruyere Ease
I Sail The Trackless Seas Of Cheese
For Pirates' Gold I Do Not Lust
Just Parmesan That's Unlike Sawdust

// Remember, kids, nothing says poetry like lowercase ;)
echo strtolower($poem);

on a nutty zephyr of gruyere ease
i sail the trackless seas of cheese
for pirates' gold i do not lust
just parmesan that's unlike sawdust

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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