php小技巧-截取后缀

截取后缀

$str = 'mystery.jpg';

$ext = substr($str, strrpos($str, '.')+1);  //后缀带"."

$ext = substr($str, strrpos($str, '.'));  //后缀不带"."

获取毫秒是时间戳

$mtime = explode(' ', microtime());

substr($mtime[0], 2);