在页面中显示HTML源码
做一个简单的实例来在页面中显示HTML源码
<?php
echo htmlentities('<!doctype html>').'<br>';
echo htmlentities('<html>').'<br>';
echo htmlspecialchars('<head>').'<br>';
echo htmlentities('<meta charset="UTF-8">').'<br>';
echo htmlentities('<title>HTML源码在页面中输出</title>').'<br>';
echo htmlspecialchars('</head>').'<br>';
echo htmlentities('<body>').'<br>';
echo htmlentities('<h3>在页面中输出HTML源码实例</h3>').'<br>';
echo htmlentities('</body>').'<br>';
echo htmlentities('</html>').'<br>';