how to Export Mysql database Using php script method-2

<?php
//export database

function export_tables($host,$user,$pass,$name,  $tables=false, $backup_name=false ){
   
    $link = mysqli_connect($host,$user,$pass,$name);
    // Check connection
    if (mysqli_connect_errno())   {
          echo "Failed to connect to MySQL: " . mysqli_connect_error();  
     }
     mysqli_select_db($link,$name);//select database
    mysqli_query($link,"SET NAMES 'utf8'");

    //get all of the tables
    if($tables === false){
        $tables = array();
        $result = mysqli_query($link,'SHOW TABLES');
        while($row = mysqli_fetch_row($result))
        {
            $tables[] = $row[0];
        }
    }else{
        $tables = is_array($tables) ? $tables : explode(',',$tables);
    }
    $return='';
    //cycle through
    foreach($tables as $table)
    {
        $result = mysqli_query($link,'SELECT * FROM '.$table);
        $num_fields = mysqli_num_fields($result);
        $row2 = mysqli_fetch_row(mysqli_query($link, 'SHOW CREATE TABLE '.$table));
        $return.= "\n\n".$row2[1].";\n\n";

        for ($i = 0; $i < $num_fields; $i++){
            $st_counter= 0;
            while($row = mysqli_fetch_row($result)){
                //create new command if when starts and after 100 command cycle
                if ($st_counter%100 == 0 || $st_counter == 0 )  {
                    $return.= "\nINSERT INTO ".$table." VALUES";
                }
                $return.="\n(";
                for($j=0; $j<$num_fields; $j++){
                    $row[$j] = addslashes($row[$j]);
                    $row[$j] = str_replace("\n","\\n",$row[$j]);
                    if (isset($row[$j])) { 
                            $return.= '"'.$row[$j].'"' ; 
                    } else {
                           $return.= '""'; 
                     }
                    if ($j<($num_fields-1)) { 
                           $return.= ','; 
                     }
                }
                $return.=")";
    //create new command if when starts and after 100 command cycle (but detect this 1 cycle earlier !)
     if ( ($st_counter+1)%100 == 0  && $st_counter != 0 )    {   
                      $return.= ";"; 
      }else{  
            $return.= ","; 
      }
          //+++++++
          $st_counter = $st_counter +1 ;
    }
       //as we cant detect WHILE loop end, so, just detect, if last command ends 
       //with comma(,) then replace it with semicolon(;)
       if (substr($return, -1) == ',') {
           $return = substr($return, 0, -1). ';'; 
       }
    }
        $return.="\n\n\n";
    }

    //save file
    $backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).'.sql';
    file_put_contents($backup_name,$return);
    die('SUCCESS. Download BACKUP file: <a target="_blank" href="'.$backup_name.'">'.$backup_name.'</a> <br/><br/>After download, <a target="_blank" href="?delete_filee='.$backup_name.'">Delete it!</a> ');

}
$username = "s2TWrtD3KehO9R6";
$password = "BROGdzF5tN8qiavu";
$hostname = "repairwirelessca.netfirmsmysql.com";
$dbname="wordpress_cod2hb6526";
export_tables($hostname,$username,$password,$dbname);

?>