无法从类方法将值写入全局 PHP 数组

Question

PHP 不是我的强项，但我今天尝试了一些 OO 代码。除了我在全局级别的 $replyArray 数组没有被我的 solSet 对象的 jumble() 类方法写入之外，一切都很好。我的代码中倒数第二个 var_dump 显示了一个空数组。我尝试过使用全局关键字，但没有帮助。因为我通过引用我新实例化的类来显式传递这个变量，这还不够吗？ 谢谢！ kk

<?php


//create a solution set for translation of incoming user login requests

$widhi = 600;
$tileDim = 25;
$randArray = array ("0","1","2","3","4","5");
$replyArray = array ();


//create 5 positions and ensure neither overlap or edge collision
class solSet
{
  var $pos1;
  var $pos2;
  var $pos3;
  var $pos4;
  var $pos5;
  var $pos6;


  public function jumble($wh,$ts,$arrShuf,$reply)
  {
    foreach($this as $key => $value)
    {
      $newX = rand (($ts/2),$wh - ($ts/2));
      $newY = rand (($ts/2),$wh - ($ts/2));
      $randNo = array_pop($arrShuf);
      $value = "" . $newX . "_" . $newY . "_" . $randNo;
      $this->$key = $value;
      //push coords onto an array for later ajax
      $pushElem = "" . $newX . "_" . $newY;
      $reply[] = $pushElem;
    }
  }

}


//scramble the random number array for later popping
shuffle($randArray);

//make a solution object
$aSolSet = new solSet;
$aSolSet->jumble($widhi,$tileDim,$randArray,$replyArray);

//store it in a session
session_start();
$_SESSION["solSet"] = $aSolSet;

echo var_dump($replyArray);
echo json_encode($aSolSet);

?>

这似乎与： Using a global array inside a class 但这就是我所做的。整个世界和他的狗都在说全球关键词是“做错了”。怎么办？

Answer 1

您的jumble 方法需要通过引用获取$replyArray - 默认情况下，PHP 函数按值操作，这意味着它们对变量的副本进行操作，而不是修改它。见http://php.net/manual/en/language.references.pass.php

改变

public function jumble($wh,$ts,$arrShuf,$reply)

到

public function jumble($wh,$ts,$arrShuf,&$reply)

变量名前面的和号表示参数是通过引用传递的。

Answer 2

或者，您可以简单地返回新的随机数组，而不是从类中更新全局变量（不利于重用和可移植性）：

public function jumble($wh,$ts,$arrShuf)
{
  $reply = array();
  foreach($this as $key => $value)
    {
      $newX = rand (($ts/2),$wh - ($ts/2));
      $newY = rand (($ts/2),$wh - ($ts/2));
      $randNo = array_pop($arrShuf);
      $value = "" . $newX . "_" . $newY . "_" . $randNo;
      $this->$key = $value;

      //push coords onto an array for later ajax
      $pushElem = "" . $newX . "_" . $newY;
      $reply[] = $pushElem;
    }

  return $reply;
}

...并使用响应更新您的全局$replyArray：

//make a solution object
$aSolSet = new solSet;
$replyArray = $aSolSet->jumble($widhi,$tileDim,$randArray);

您甚至根本不需要将$reply 参数传递到您的方法中（注意，少了一个参数），一切都很好且独立。

Answer 3

在函数中引用全局数组

 global $replyArray;