php 写一个今年是什么生肖年

<?php

$year = ‘2018’;

$zodiac = array('shu','niu','hu','tu','long','she','ma','yang','hou','ji','gou','zhu');

$diNum = fmod($year,12);

$zhi = $diNum > 3 ?  $diNum - 3 :  $diNum - 3 + 12;

echo $zodiac[$zhi -1];

?>