php URL encoding and decoding function code

<?php 
$url = "http://www.php.cn"; 
echo urlencode($url); //输出编码后的字符串 
?>

<?php 
$url = "http://www.php.cn"; 
$newurl = urlencode($url); //首先对$url进行编码 
echo urldecode($newurl); //输出解码后的字符串 
?>

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