import base64

def gg(a, c):
        f = h = 0
        b = list(range(256))
        result = ''
        while h < 256:
            f = (f + b[h] + ord(a[h % len(a)])) % 256
            b[h], b[f] = b[f], b[h]
            h += 1
        q = f = h = 0
        while q < len(c):
            h = (h + 1) % 256
            f = (f + b[h]) % 256
            b[h], b[f] = b[f], b[h]
            if isinstance(c[q], int):
                result += chr(c[q] ^ b[(b[h] + b[f]) % 256])
            else:
                result += chr(ord(c[q]) ^ b[(b[h] + b[f]) % 256])
            q += 1

        return result

if __name__ == '__main__':
    q = "MQXVSggWJLjT1vjI/eJxW9ai70Jv1w/CXBs="
    a = base64.b64decode(bytes(q, 'ascii'))
    code = gg('becaf9be', a)
    print(code)

PHP怎么实现