php man page for strtoupper

STRTOUPPER(3)								 1							     STRTOUPPER(3)

strtoupper - Make a string uppercase

SYNOPSIS
       string strtoupper (string  $string)

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

	Note  that  'alphabetic' is determined by the current locale. For instance, 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 uppercased string.

EXAMPLES
       Example #1

	      strtoupper(3) example

	      <?php
	      $str = "Mary Had A Little Lamb and She LOVED It So";
	      $str = strtoupper($str);
	      echo $str; // Prints MARY HAD A LITTLE LAMB AND SHE LOVED IT SO
	      ?>

NOTES
       Note

	      This function is binary-safe.

SEE ALSO
       strtolower(3), ucfirst(3), ucwords(3), mb_strtoupper(3).

PHP Documentation Group 													     STRTOUPPER(3)