Leetcode PHP题解--D82 13. Roman to Integer

<?php
class Solution {    /**
     * @param String $s
     * @return Integer
     */
    function romanToInt($s) {
        $ss = str_replace([&#39;CM&#39;,&#39;CD&#39;,&#39;XC&#39;,&#39;XL&#39;,&#39;IX&#39;,&#39;IV&#39;,&#39;M&#39;,&#39;D&#39;,&#39;C&#39;,&#39;L&#39;,&#39;X&#39;,&#39;V&#39;,&#39;I&#39;],[&#39;,900,&#39;,&#39;,400,&#39;,&#39;,90,&#39;,&#39;,40,&#39;,&#39;,9,&#39;,&#39;,4,&#39;,&#39;,1000,&#39;,&#39;,500,&#39;,&#39;,100,&#39;,&#39;,50,&#39;,&#39;,10,&#39;,&#39;,5,&#39;,&#39;,1,&#39;],$s);        return array_sum(array_filter(explode(&#39;,&#39;, $ss)));
    }
}