how to import sql file in database in php

function  import_db($mysql_username,$mysql_password,$mysql_host,$mysql_database)
{
    // Name of the file
    $filename = $file_path.'/sql/database.sql';
   

    // Connect to MySQL server
    $db_conn = mysqli_connect($mysql_host, $mysql_username, $mysql_password,$mysql_database) 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
        mysqli_query($db_conn,$templine) or print('Error performing query \'<strong>' . $templine . '\': ' . mysql_error() . '<br /><br />');
        // Reset temp variable to empty
        $templine = '';
    }
    }
    //echo "Tables imported successfully";

}