php man page for strtolower

STRTOLOWER(3)								 1							     STRTOLOWER(3)

strtolower - Make a string lowercase

SYNOPSIS
       string strtolower (string  $string)

DESCRIPTION
	Returns $string with all alphabetic characters converted to lowercase.

	Note  that  'alphabetic'  is determined by the current locale. This means that e.g. in the default "C" locale, characters such as umlaut-A
       (A) will not be converted.

PARAMETERS
	      o $string
		- The input string.

RETURN VALUES
	Returns the lowercased string.

EXAMPLES
       Example #1

	      strtolower(3) example

	      <?php
	      $str = "Mary Had A Little Lamb and She LOVED It So";
	      $str = strtolower($str);
	      echo $str; // Prints mary had a little lamb and she loved it so
	      ?>

NOTES
       Note

	      This function is binary-safe.

SEE ALSO
       strtoupper(3), ucfirst(3), ucwords(3), mb_strtolower(3).

PHP Documentation Group 													     STRTOLOWER(3)