我需要检查whmcs模块的代码

Question

当我打开whmcs模块文件时，我看到了

1&&$__id[1]==':'){$__id=str_replace('\\','/',substr($__id,2));$__here=str_replace('\\','/',substr($__here,2));}$__rd=str_repeat('/..',substr_count($__id,'/')).$__here.'/';$__i=strlen($__rd);while($__i--){if($__rd[$__i]=='/'){$__lp=substr($__rd,0,$__i).$__ln;if(file_exists($__oid.$__lp)){$__ln=$__lp;break;}}}if(function_exists('dl')){@dl($__ln);}}else{die('The file '.__FILE__." is corrupted. Ensure that you use binary mode when transferring files with FTP and disable the 'TAR smart cr/lf feature' if using WinZIP\n");}if(function_exists('_il_exec')){return _il_exec();}echo("Site error: the ".(php_sapi_name()=='cli'?'ionCube':'ionCube')." PHP Loader needs to be installed. This is a widely used PHP extension for running ionCube protected PHP code, website security and malware blocking.\n\nPlease visit ".(php_sapi_name()=='cli'?'get-loader.ioncube.com':'get-loader.ioncube.com')." for install assistance.\n\n");exit(199);
?>
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在代码中我怎么知道在这里使用哪个代码