这个js文件怎么转换成php文件，到了for后面我就不会了😓

Question

function login(a)
{
return this.securityEncode(a,
"RDpbLfCPsJZ7fiv",
"yLwVl0zKqws7LgKPRQ84Mdt708T1qQ3Ha7xv3H7NyU84p21BriUWBU43odz3iP4rBL3cD02KZciXTysVXiV8ngg6vL48rPJyAUw0HurW20xqxv9aYb4M9wK1Ae0wlro510qXeU07kV57fQMc8L6aLgMLwygtc0F10a0Dg70TOoouyFhdysuRMO51yY5ZlOZZLEal1h0t9YQW0Ko7oBwmCAHoic4HYbUyVeU3sfQ1xtXcPcf1aT303wAQhv66qzW")
};
this.securityEncode=function(a,c,b)
{
var d="",
f,e,g,h,k=187,
l=187;
e=a.length;
g=c.length;
h=b.length;
f=e > g ? e : g;
    for(var m=0 ; m<f ; m++) l = k = 187,
    m >= e ? l = c.charCodeAt(m):
    m >= g ? k=a.charCodeAt(m):
        (
        k=a.charCodeAt(m)
        ,l=c.charCodeAt(m)
        ),
    d += b.charAt((k ^ l) % h);
    return d
};

let r = login('zh955');
console.log(r);

Answer 1

完全看不懂写的是啥