How to import .sql file in mysql database using php

<?php
           // Name of the file
          $filename = 'filename.sql';
          // MySQL host
          $mysql_host = 'localhost';
         // MySQL username
         $mysql_username = 'root';
        // MySQL password
        $mysql_password = '';
        // Database name
        $mysql_database = 'dbName';

        // Connect to MySQL server
        mysql_connect($mysql_host, $mysql_username, $mysql_password) or die('Error connecting to           MySQL server: ' . mysql_error());
       // Select database
       mysql_select_db($mysql_database) or die('Error selecting MySQL database: ' . mysql_error());

      // Temporary variable, used to store current query
      $templine = '';
     // Read in entire file
     $lines = file($filename);
     // Loop through each line
      foreach ($lines as $line)
       {
         // Skip it if it's a comment
           if (substr($line, 0, 2) == '--' || $line == '')
           continue;

        // Add this line to the current segment
        $templine .= $line;
       // If it has a semicolon at the end, it's the end of the query
        if (substr(trim($line), -1, 1) == ';')
       {
          // Perform the query
            mysql_query($templine) or print('Error performing query \'<strong>' . $templine . '\': ' .                      mysql_error() . '<br /><br />');
           // Reset temp variable to empty
          $templine = '';
          }
}
 echo "Tables imported successfully";
?>