使用php重定向到随机URL

Question

我尝试过使用here

#include "Keypad.h"
#include "LiquidCrystal.h" 
#include "Password.h"
LiquidCrystal lcd(0,1,10,11,12,13);
char newPasswordString; //hold the new password
char newPassword[4]; //character string of newPasswordString

//initialize password to 1234
//you can use password.set(newPassword) to overwrite it
Password password = Password("1234");

byte maxPasswordLength = 6; 
byte currentPasswordLength = 0;
// keypad type definition
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};

byte rowPins[ROWS] = {9,8,7,6}; //Rows 0 to 4
byte colPins[COLS]= {5,4,3,2}; //Columns 0 to 4

int count=0;

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup()
{

  lcd.begin(16, 2);
  mainScreen();
}

void loop(){
   char key = keypad.getKey();
   if (key != NO_KEY){
      delay(60); 
      switch (key){
      case 'A': activate(); break; 
      case 'B': break; 
      case 'C': break; 
      case 'D': deactivate(); break; 
      case '#':  break;
      case '*': break;
      default: processNumberKey(key);
      }
   }
}

void processNumberKey(char key) {
   lcd.print(key);
   currentPasswordLength++;
   password.append(key);
   if (currentPasswordLength == maxPasswordLength) {
      activate();
   } 
}

void activate() {
   if (password.evaluate()){
      lcd.clear();
      lcd.print("Activated.");
      delay(1000);
      mainScreen();
   } else {
      lcd.clear();
      lcd.print("Wrong Password!");
   } 
}

void deactivate(){
    if (password.evaluate()){
      lcd.clear();
      lcd.print("Deactivated.");
      delay(1000);
      mainScreen();
   } else {
      lcd.clear();
      lcd.print("Wrong Password!");
      delay(1000);
      mainScreen();
   } 
}

void mainScreen(){
  lcd.clear();
  lcd.print("Enter Pin:");
  keypad.getKey();


}

但每次我打开另一个标签并加载<?php $urls = array('http://1.com',"http://2.com","http://3.com"); //specify array of possible URLs $rand = rand(0,count($urls)-1); //get random number between 0 and array length $location = $urls[$rand]; //get random item from array header ('HTTP/1.1 301 Moved Permanently'); //send header header ('Location: '.$location); ?> 时，我每次都会得到index.php。

我该如何解决这个问题？

提前致谢。