PHP filters disabled characters before entering the database (PHP code function)

//PHP filters disabled characters before entering the database (php code function)


function safe_str($str){
 $array=array('receive.php','select','insert', 'update','delete','union','into','load_file','outfile');
 if(!is_array($str)){
 foreach($array as $v){
 $str= preg_replace("#({$v})#i","-\$小贝-",$str);
 }
 //$str=preg_replace("![][xX]([A-Fa- f0-9])!","x \$小贝",$str);
 $str=str_replace("'",''',$str);
 $str=str_replace('"' ,'"',$str);
 $str=str_replace("--",'-',$str);
 $str=str_replace("\*",'\-*',$str );
 $str=str_replace("\\",'monxin_backslash',$str);
 $r=$str;
 }else{
 $r=array();
 foreach($str as $key=> ;$value){
 //$key=safe_str($key);
 $r[$key]=safe_str($value);
 }
 }

 return $r;
}

PHP