如何将mysql更改为mysqli？我尝试了很多方法，但总是出现错误：(

Question

我尝试了许多方法，但总是出现错误：)应该怎么办？我尝试了一些在线转换器工具，但没有任何改变。是否有用于将mysql更改为mysqli的详细教程？我尝试了许多方法，但总是出现错误：)应该怎么办？我尝试了一些在线转换器工具，但没有任何改变。是否有用于将mysql更改为mysqli的详细教程？

<?php
class db_mysql{
function connect($z){
    mysql_connect($z["locals"],$z["usern"],$z["passw"]);
    mysql_select_db($z["databasename"]);
    $this->dbconfig=$z;
    $this->query("SET NAMES 'utf8'");
    $this->query("SET CHARACTER SET utf8");
    $this->query("SET COLLATION_CONNECTION = 'utf8'");
    return true;
}
function query($query){
      $this->last_query=str_replace("{prefix}",$this->dbconfig["prefix"],$query);
      $time = microtime();
      $time = explode(' ', $time);
      $time = $time[1] + $time[0];
      $start = $time;
      $return=mysql_query($this->last_query);
      $time = microtime();
      $time = explode(' ', $time);
      $time = $time[1] + $time[0];
      $finish = $time;
      $total_time = round(($finish - $start), 4);
      if(defined("DEBUG")){
          global $base;
          $base["debug"]->add("SQL query: ".htmlentities(substr(mysql_real_escape_string($this->last_query),0,100))." (".$total_time." sn)",__FILE__,__LINE__);
      }
  //  echo "<!--".$this->last_query."-->";
    if(!$return){
      if(defined("DEBUG") && 1==2){
          die(" Database error :".$this->last_query);
      }else{
      //  die("Error.");
      }
    }
    return $return;
}
function last_query(){
  return $this->last_query;
}
function delete($from,$where){
  return  $this->query("delete from ".$from." ".$this->where($where));
 }
function result($z,$key){
  if(is_array($z)){
   $sql="select ".implode(",",$z["select"])." from ".$z["from"]." ".$this->where($z["from"]);
  }else{
    $sql=$z;
  }
  $query=$this->query($sql);
  while($f[]=$this->fetch($query));
  $f=array_filter($f);
  if($key!="0"){
      foreach($f as $k){
          $za[$k[$key]]=$k;
      }
      $f=$za;
  }
  return $f;
}
function aresult($z){
  return current($this->result($z));
}
function fetch($query){
  return @mysql_fetch_assoc($query);
}
function update($from,$z,$where){
    foreach($z as $key=>$value){
  $set[]="`$key` = '".$this->escape($value)."'";
    }
  return $this->query("update ".$from." set ".implode(",",$set).$this->where($where));

}
function insert($from,$z){
    foreach($z as $key=>$value){
  $ke[]=$key;
  $val[]=$this->escape($value);
    }
    return $this->query("INSERT INTO ".$from." (`".implode("`,`",$ke)."`)VALUES('".implode("','",$val)."')");
}
function insert_id(){
  return mysql_insert_id();
}
function escape($string){
    return mysql_real_escape_string($string);
}
function where($where=null){
  if(is_array($where)){
    foreach($where as $name=>$p){
  $w[]="`".$name."` = '".$this->escape($p)."'";
    }
    return "where ".implode(" AND ",$w);
  }else{
    return "";
  }
}
} ```