PHP Functions Essential Reference

strtolower

string strtolower(string string) 

Converts a string to lowercase.

Returns:

Lowercase string

Description:

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

Note:

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

Version:

PHP 3+, PHP 4+

See also:

To alter the case of a string:

strtoupper() 
ucfirst() 
ucwords() 

Example:

Convert a block of text to lowercase

<?php $poem = <<<_SAIL_ On A Nutty Zephyr Of Gruyere Ease I Sail The Trackless Seas Of Cheese For Pirates' Gold I Do Not Lust Just Parmesan That's Unlike Sawdust _SAIL_; // Remember, kids, nothing says poetry like lowercase ;) echo strtolower ($poem); ...