title: PHP Warning: mysql_fetch_row() expects parameter 1 to be resource, boolean given in
body: <p>I don't know why I recieve this error.</p>
  
  <p>Here is what my code looks like:<br></p>
  
  <pre><code>&lt;?php ini_set('memory_limit', '1000M'); set_time_limit(0); 
  backup_tables('host','dbuser','password','dbname','dbtable');
  
  function backup_tables($host,$user,$pass,$name,$tables = '*') 
  { 
  $link = mysql_connect($host,$user,$pass); 
  mysql_select_db($name,$link); 
  if($tables == '*') { 
    $tables = array(); 
    $result = mysql_query('SHOW TABLES'); 
     while($row = mysql_fetch_row($result)) { 
       $tables[] = $row[0]; 
       } 
   } else { 
    $tables = is_array($tables) ? $tables : explode(',',$tables); 
    }
    foreach($tables as $table) { 
    $result = mysql_query('SELECT * FROM '.$table); 
    $num_fields = mysql_num_fields($result);
    $row2 = mysql_fetch_row(mysql_query('SHOW CREATE TABLE '.$table)); 
    $return.= "\n\n".$row2[1].";\n\n"; 
    for ($i = 0; $i &lt; $num_fields; $i++) { 
      while($row = mysql_fetch_row($result)) {
        $return.= 'INSERT INTO '.$table.' VALUES('; 
          for($j=0; $j&lt;$num_fields; $j++) { 
            $row[$j] = addslashes($row[$j]); 
            $row[$j] = preg_replace("/\n/i", "\\n",$row[$j]);; 
              if (isset($row[$j])) { 
                $return.= '"'.$row[$j].'"' ; 
              } else { 
                 $return.= '""'; 
               } 
               if ($j&lt;($num_fields-1)) { 
               $return.= ','; 
                } 
               } 
               $return.= ");\n"; 
                 } 
                 } 
              $return.="\n\n\n"; 
                 } 
              $handle = fopen('db-backup-'.time().'-'.(md5(implode(',',$tables))).'.sql','w+');  
              fwrite($handle,$return); fclose($handle); 
                } ?&gt;
  </code></pre>