PHP Compile Handlebars Templates on Modification

gistfile1.php

<?php

class HandlebarsCompile
{
    private static $tmpFile = 'cache/handlebarscompile.txt';
    private static $templateFiles = 'views/templates/*';
    private static $outputFile = 'assets/js/templates.js';

    public static function Check() {
        $tmpFile = self::$tmpFile;
        if(!file_exists($tmpFile)) {
            file_put_contents('hbs', "#!/bin/bash\nPATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin\nhandlebars $1 -f $2 -m");
            chmod('hbs', 0777);
            touch($tmpFile);
        }
        $tmpStat = stat($tmpFile);
        $lastmod = $tmpStat['mtime'];
        $dirty = FALSE;
        foreach (glob(self::$templateFiles) as $file) {
            if(filemtime($file) > $lastmod) {
                $dirty = TRUE;
            }           
        }

        if($dirty) {
            touch($tmpFile);
            exec('./hbs "'.self::$templateFiles.'" "'.self::$outputFile.'"');
        }
    }
}

HandlebarsCompile::Check();