文字を小文字にする mb_strtolower

mb_strtolower ( string $string , string|null $encoding = null ) : string

<?php
// Your code here!
$string = "Eight apes ate eight apples.";
echo mb_strtolower ($string);
echo "\n";

$string = "Little Linda Lamb licks her lovely lips.";
echo mb_strtolower ($string);
echo "\n";

//日本語は変化ないですね。
$string = "となりの客はよく柿食う客だ";
echo mb_strtolower ($string);
echo "\n";

//フランス語
$string = "Comment allez-vous? ";
echo mb_strtolower ($string);
echo "\n";

//ドイツ語
$string = "TschÜss.  ";
echo mb_strtolower ($string);
echo "\n";

?>