How to convert string to uppercase in PHP?

#PHP How to convert a string to uppercase?

In PHP, you can use the "strtoupper()" function to convert a string to uppercase.

Syntax and Description

strtoupper ( string $string ) : string

Converts all alphabetic characters in string to uppercase and back.

Note that "letter" is related to the current area. For example, in the default "C" locale, the character umlaut-a (ä) is not converted.

Code sample

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

Recommended tutorial: "PHP Tutorial"

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