<?php
header("Content-type: text/html; charset=utf-8");
$data1 = "PHP";
$data2 = "PHP:Hypertext Preprocessor";
$data3 = "ピーエッチピー";
$data4 = "";
echo $data1 . "→" . strlen($data1) . "<br>";
echo $data2 . "→" . strlen($data2) . "<br>";
echo $data3 . "→" . strlen($data3) . "<br>";
echo $data4 . "→" . strlen($data4) . "<br>";
?>