基于PHP实现解密或加密Cloudflar邮箱保护

<a class="__cf_email__" data-cfemail="30515253705152531e535f5d" href="/cdn-cgi/l/email-protection" rel="external nofollow" >
[email protected]
</a>
<script data-cfhash="f9e31" type="text/javascript">
 / <![CDATA[ /!function(t,e,r,n,c,a,p){try{t=document.currentScript||function(){for(t=document.getElementsByTagName('script'),e=t.length;e--;)if(t[e].getAttribute('data-cfhash'))return t[e]}();if(t&&(c=t.previousSibling)){p=t.parentNode;if(a=c.getAttribute('data-cfemail')){for(e='',r='0x'+a.substr(0,2)|0,n=2;a.length-n;n+=2)e+='%'+('0'+('0x'+a.substr(n,2)^r).toString(16)).slice(-2);p.replaceChild(document.createTextNode(decodeURIComponent(e)),c)}p.removeChild(t)}}catch(u){}}()/ ]]> /
</script>

function deCFEmail($encode){
	$k = hexdec(substr($encode,0,2));
	for($i=2, $m=''; $i < strlen($encode) - 1; $i += 2){
		$m.=chr(hexdec(substr($encode, $i, 2))^$k);
	}
	return $m;
}
echo deCFEmail("30515253705152531e535f5d")."\n";

function encodeEmail($email, $key=0) {
	$chars = str_split($email);
	$string = '';
	$key = $key ? $key : rand(10, 99);
	foreach ($chars as $value) {
		$string .= sprintf("%02s", dechex(ord($value)^$key));
	}
	return dechex($key).$string;
}