How to remove web viruses_PHP tutorial

Do your web pages often add some Trojan horse addresses in the background of php, asp, html, js and other files for no reason? I used to have a website like this, so I wrote this paragraph out of hatred Although the code and article are a bit of a waste of resources, it is better than manual removal. Now I will talk about the principle of virus removal in the program.

First we need to read the $checkFile file. This article is to determine whether an article is infected. If so, all files in the txt file path in the $savafile variable will be executed and cleared according to your infecFile virus list.

Class clear_virus{
//public $content;
public $infectFile ='virus.txt';//Virus file list file
public $savefile ="save.txt";//List of files to view viruses
public $timep ='time.txt';//Some records of virus removal time
public $checkFile ='e.php';//Here are the settings
public $run =0;
public $virus_type;
public $replace ;
public $filepath ;
public $tag =0;
 
function open_file(){
$this->read_virus();
$this->check_File();
if($this->run){
$this->update_time();
$this->read_file() ;
foreach($this->filepath as $tmppath){
If(file_exists($tmppath)){
        $tmp_file =file_get_contents($tmppath);
         print_r( $this->virus_type);                             for( $i=0;$ivirus_type);$i++ ){
               if( strrpos($tmp_file,$this->virus_type[$i])!== false){
             $tmp_file =str_replace($this->virus_type[$i],'',$tmp_file);
                $this->tag =1;                                                                                                                                                                          }
If( $this->tag ){
           $handle =fopen($tmppath,'w');
             fwrite($handle,$tmp_file);
             fclose($handle);
            unset($tmp_file);
                                                                                
       }else{
;
                                                                   }  
}
}

function check_File(){
If(file_exists($this->checkFile) ){
$temp =file_get_contents($this->checkFile) ;
echo $temp;
foreach( $this->virus_type as $v_tmp ){
If( strrpos($temp,$v_tmp)!== false ){
         $this->run =1;
        break;
}
}
echo $this->run;
                                                                                                                                                  unset($temp); }else{
$this->show_error(5);
}
}

function update_time(){
If(file_exists($this->timep) ){
$tmp_time =date("Y-m-d H:i:s").chr(13).'|';
$tmp_fp =fopen($this->timep,'a+');
​​fwrite($tmp_fp,$tmp_time);
                                                                                                                                  }
 
}


function read_File(){
if(file_exists($this->savefile) ){
$this->content =file($this->savefile);
If(is_array($this->content)){
$this->filepath =$this->content;
}else{
$this->show_error(3);
}
}else{
$this->show_error(4);
}  
}


function read_virus(){
if(file_exists($this->infectFile) ){
$this->replace =file($this->infectFile);
If(is_array($this->replace)){
$this->virus_type=$this->replace;
}else{
$this->show_error(1);
}
}else{
$this->show_error(2);
}  
}


function show_error($number){
$array = array(
'1'=>'The virus file cannot be read!',
'2'=>'The virus file list does not exist!',
'3'=>'The file list is no longer saved',
'4'=>'The scanned files are not saved',
'5'=>$this->$checkFile.'Does not exist, please set the virus infection file'
);
echo $array[$number];
}
 
}
$virus =new clear_virus;
$virus->open_file();
?>
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