Build menu for group

<?php
$lines = file('menu.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$id = 1;
$parentId = 0;
$table = 'menu';
$perm_table = 'group_menu';
echo "TRUNCATE $table;\n";
echo "TRUNCATE $perm_table;\n";
foreach ($lines as $line) {
    if ($line[0] != '-') {
        $parentId = 0;
        $arr = explode(",", $line, 3);
        $num = count($arr);
        $title = $arr[0];
        $url = $arr[1];
        $modules = isset($arr[2]) ? $arr[2] : '';
        $sql = "INSERT INTO $table SET id=$id, title='$title', url='$url', parent_id='$parentId', modules='$modules';";
        echo $sql . "\n";
        $parentId = $id;
    } else {
        $line = substr($line, 2);
        $arr = explode(",", $line, 3);
        $num = count($arr);
        $title = $arr[0];
        $url = $arr[1];
        $modules = isset($arr[2]) ? $arr[2] : '';
        $sql = "INSERT INTO $table SET id=$id, title='$title', url='$url', parent_id='$parentId', modules='$modules';";
        echo $sql . "\n";
    }
    $id++;
}

?>