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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP 常量 const 实例 - 自学教程(runoops.com)</title>
</head>
<body>
<?php
const SITE_URL = "https://www.runoops.com";
echo SITE_URL; // 输出 "https://www.runoops.com"
?>
</body>
</html>