Functions in php that may be used to encrypt strings

The login principle is quite complicated. It is too simple for me to think that curl will get the page and then post it.

Sort out the functions of price processing strings encountered:

<?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>"; 
?>

Record their approximate appearance so that they can be quickly identified when encountering such processing in the future.

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