最近在github中看到一个python的PPTV的接口，有人能帮忙把此接口当中的算法转换成PHP吗？

<code>#!/usr/bin/env python

__all__ = ['pptv_download', 'pptv_download_by_id']

from ..common import *

import re
import time
import urllib
from random import random


def constructKey(arg):

    def str2hex(s):
        r=""
        for i in s[:8]:
            t=hex(ord(i))[2:]
            if len(t)==1:
                t="0"+t
            r+=t
        for i in range(16):
            r+=hex(int(15*random()))[2:]
        return r

    #ABANDONED  Because SERVER_KEY is static
    def getkey(s):
        #returns 1896220160
        l2=[i for i in s]
        l4=0
        l3=0
        while l4<len l5="l2[l4]" l6="ord(l5)" l7="l6<<((l4%4)*8)" l3="l3^l7" l4 return pass def rot>>> in as3
        if k>=0:
            return k>>b
        elif k>b
        pass

    def lot(k,b):
        return (k([^]+)', xml)
    k = r1(r'<key expire="[^<">]+>([^]+)</key>', xml)
    rid = r1(r'rid="([^"]+)"', xml)
    title = r1(r'nm="([^"]+)"', xml)

    st=r1(r'<st>([^]+)</st>',xml)[:-4]
    st=time.mktime(time.strptime(st))*1000-60*1000-time.time()*1000
    st+=time.time()*1000
    st=st/1000

    key=constructKey(st)

    pieces = re.findall('<sgm no="(\d+)">]+fs="(\d+)"', xml)
    numbers, fs = zip(*pieces)
    urls=["http://{}/{}/{}?key={}&fpp.ver=1.3.0.4&k={}&type=web.fpp".format(host,i,rid,key,k) for i in range(max(map(int,numbers))+1)]

    total_size = sum(map(int, fs))
    assert rid.endswith('.mp4')
    print_info(site_info, title, 'mp4', total_size)

    if not info_only:
        try:
            download_urls(urls, title, 'mp4', total_size, output_dir = output_dir, merge = merge)
        except urllib.error.HTTPError:
            #for key expired
            pptv_download_by_id(id, output_dir = output_dir, merge = merge, info_only = info_only)

def pptv_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
    assert re.match(r'http://v.pptv.com/show/(\w+)\.html$', url)
    html = get_html(url)
    id = r1(r'webcfg\s*=\s*{"id":\s*(\d+)', html)
    assert id
    pptv_download_by_id(id, output_dir = output_dir, merge = merge, info_only = info_only)
</sgm></len></code>

回复内容：

<code>#!/usr/bin/env python

__all__ = ['pptv_download', 'pptv_download_by_id']

from ..common import *

import re
import time
import urllib
from random import random


def constructKey(arg):

    def str2hex(s):
        r=""
        for i in s[:8]:
            t=hex(ord(i))[2:]
            if len(t)==1:
                t="0"+t
            r+=t
        for i in range(16):
            r+=hex(int(15*random()))[2:]
        return r

    #ABANDONED  Because SERVER_KEY is static
    def getkey(s):
        #returns 1896220160
        l2=[i for i in s]
        l4=0
        l3=0
        while l4<len l5="l2[l4]" l6="ord(l5)" l7="l6<<((l4%4)*8)" l3="l3^l7" l4 return pass def rot>>> in as3
        if k>=0:
            return k>>b
        elif k>b
        pass

    def lot(k,b):
        return (k([^]+)', xml)
    k = r1(r'<key expire="[^<">]+>([^]+)</key>', xml)
    rid = r1(r'rid="([^"]+)"', xml)
    title = r1(r'nm="([^"]+)"', xml)

    st=r1(r'<st>([^]+)</st>',xml)[:-4]
    st=time.mktime(time.strptime(st))*1000-60*1000-time.time()*1000
    st+=time.time()*1000
    st=st/1000

    key=constructKey(st)

    pieces = re.findall('<sgm no="(\d+)">]+fs="(\d+)"', xml)
    numbers, fs = zip(*pieces)
    urls=["http://{}/{}/{}?key={}&fpp.ver=1.3.0.4&k={}&type=web.fpp".format(host,i,rid,key,k) for i in range(max(map(int,numbers))+1)]

    total_size = sum(map(int, fs))
    assert rid.endswith('.mp4')
    print_info(site_info, title, 'mp4', total_size)

    if not info_only:
        try:
            download_urls(urls, title, 'mp4', total_size, output_dir = output_dir, merge = merge)
        except urllib.error.HTTPError:
            #for key expired
            pptv_download_by_id(id, output_dir = output_dir, merge = merge, info_only = info_only)

def pptv_download(url, output_dir = '.', merge = True, info_only = False, **kwargs):
    assert re.match(r'http://v.pptv.com/show/(\w+)\.html$', url)
    html = get_html(url)
    id = r1(r'webcfg\s*=\s*{"id":\s*(\d+)', html)
    assert id
    pptv_download_by_id(id, output_dir = output_dir, merge = merge, info_only = info_only)
</sgm></len></code>