如何把JS函数转换成PHP函数

 function Ename(e){
   for (var n, i, o = (i = n ? new Date(n) : new Date,
   new Date(i.getFullYear(),i.getMonth(),i.getDate()).getTime()), a = 0, r = 0, d = -1, l = 0; a < e.length; a++) {
   var p = e.charCodeAt(a);
   r += p,
   -1 != d && (l += d - p),
   d = p
   }
   var s = (r += l).toString(36), c = o.toString(36), u = 0;
   for (a = 0; a < c.length; a++)
   u += c.charCodeAt(a);
   c = c.substr(5) + c.substr(0, 5);
   var h, v, f = Math.abs(u - r), g = (c = s.split("").reverse().join("") + c).substr(0, 4), w = c.substr(4), m = new Array, b = new Date(o).getDay() % 2;
   for (a = 0; a < e.length; a++) {

 a % 2 == b ? m.push(c.charAt(a % c.length)) : (h = e.charAt(a - 1)) ? -1 == (v = g.indexOf(h)) ? m.push(h) : m.push(w.charAt(v)) : m.push(g.charAt(a))
   }
   return ((f.toString(36).split("").reverse().join("")) + m.join("")).substr(0, e.length);

 };