- mb_convert_encoding: documentation ( source)
- chr: documentation ( source)
- mt_rand: documentation ( source)
<?php
do {
$eai = "え" . mb_convert_encoding(chr(0x82) . chr(0x9f + mt_rand(0, 52)), 'utf-8', 'SJIS-win') . "い";
echo PHP_EOL, $eai;
} while ($eai !== "えあい");
echo "っ!";