php中可能用来加密字符串的函数[base64_encode、urlencode、sha1]

<?php 
$encryption = "username"; 
echo base64_encode ($encryption);//echo "dXNlcm5hbWU= "; 
echo "<br>"; 
echo urlencode("http://".$encryption);//echo " http%3A%2F%2Fusername "; 
echo "<br>"; 
echo sha1($encryption);//echo "249ba36000029bbe97499c03db5a9001f6b734ec" 
echo "<br>"; 
?> 
 
记录它们的大概长相，以便日后遇到类的处理能够很快辨别出来。 

顺便附上我当时找到脚本的文章地址：//www.gxlcms.com/article/29486.htm