(PHP 4, PHP 5, PHP 7, PHP 8)
strtoupper — Make a string uppercase
$string): string
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 (ä) will not be converted.
stringThe input string.
Returns the uppercased string.
Example #1 strtoupper() 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
?>
Note: This function is binary-safe.