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PHP! Hypertext Preprocessor FAQ:

Convert a string to lowercase?

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

Version PHP 3+, PHP 4+

Example
Convert a block of text to lowercase:

$emailaddress = "InFo@domainname.com";
echo strtolower($emailaddress);

Output:
info@domainname.com