Question

我正在努力通过以下PHP代码找到问题：

代码如下

class WorkerThreads extends Thread
{
  private $from_list;

  public function __construct($x,$host,$users_email,$pass,$inbox)
  {
    $this->from_list = array(); # holds the unique froms extracted from headers
  }

  public function run()
  {
    # Get Froms
    if (preg_match('/From\:\ (.+)/i', $headers, $matches, PREG_OFFSET_CAPTURE)) {
      $from = trim(str_ireplace("From: ", "", $matches[0][0]));
      if (!array_key_exists($from, $this->from_list)) {
        $this->from_list[$from] = 1;
        echo "<br/>FROM: ".$from."-".$this->from_list[$from]."<br/><br/>";
      }
    } else {
      echo "NO FROM <br/><rb/>";
    }

发生以下错误：

Notice: Undefined index: Viva in /var/www/BAMCode/yahoofroms.php on line 198    
FROM: Viva-

违规行200是

echo "<br/>FROM: ".$from."-".$this->from_list[$from]."<br/><br/>";

阵列似乎有问题

Answer 1

如果你不使用多个线程，这将完全正常。

我认为很多线程都试图修改和读取相同的列表。尝试同步from_list的修改/读取。我们可以使用互斥锁来同步读/写到from_list。

检查以下代码：

<?php
class WorkerThreads extends Thread
{
  private $from_list;
  private $mylock;

  public function __construct($x,$host,$users_email,$pass,$inbox)
  {
    $this->from_list = array(); # holds the unique froms extracted from headers
    $this->mylock = Mutex::create();
  }

  public function __destruct()
  {
    Mutex::destroy($this->mylock);
    $this->mylock = null;
  }

  public function run()
  {
    # Get Froms
    if (preg_match('/From\:\ (.+)/i', $headers, $matches, PREG_OFFSET_CAPTURE)) {
      $from = trim(str_ireplace("From: ", "", $matches[0][0]));
      Mutex::lock($this->mylock);
      if (!array_key_exists($from, $this->from_list)) {
        $this->from_list[$from] = 1;
        echo "<br/>FROM: ".$from."-".$this->from_list[$from]."<br/><br/>";
      }
      Mutex::unlock($this->mylock);
    } else {
      echo "NO FROM <br/><rb/>";
    }
  }
}

?>

无法发现PHP索引错误的问题 - 可能出现多线程问题

1 个答案: