Php : File insert mysql

<?php

$content = file_get_contents("a.txt");
$lines = explode("\n", $content);
foreach ($lines as $line) {
    $row = explode(":", $line);
    $query = "INSERT INTO tablename SET val1 = '" . trim($row[0]) . "', val2 = '" . trim($row[1]) . "'";
    mysql_query($query);
}

?>