(PHP 4, PHP 5, PHP 7, PHP 8)
strtoupper — Make a string uppercase
$string): string
Returns string with all ASCII alphabetic characters
converted to uppercase.
Bytes in the range "a" (0x61) to "z"
(0x7a) will be converted to the corresponding uppercase letter by subtracting
32 from each byte value.
This can be used to convert ASCII characters within strings encoded with UTF-8, since multibyte UTF-8 characters will be ignored. To convert multibyte non-ASCII characters, use mb_strtoupper().
stringThe input string.
Returns the uppercased string.
| Version | Description |
|---|---|
| 8.2.0 | Case conversion no longer depends on the locale set with setlocale(). Only ASCII characters will be converted. |
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.