(PHP 4, PHP 5, PHP 7)
strtoupper — Make a string uppercase
strtoupper ( string $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.
string
The 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.
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https://www.php.net/manual/en/function.strtoupper.php