php html encode
//php对html进行编码，比如留言板，保存留言内容时最好对其进行编码，保证安全。<?php
$str = "A 'quote' is <b>bold</b>";
// Outputs: A 'quote' is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str);
// Outputs: A 'quote' is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str, ENT_QUOTES);
?>
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