不能用PHP指數誤差，可能多線程問題發現問題

Question

我在努力尋找與下面的一段PHP代碼的問題：

的代碼如下

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/>"; 
    } 

以下發生錯誤：

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

有問題的行200是

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

似乎有一個陣列的問題

Answer 1

如果你不使用多線程，這將工作得很好。

我想很多線程都試圖修改和讀取相同的列表。嘗試同步修改/讀取from_list。我們可以使用一個互斥鎖來同步讀/寫from_list。

檢查下面的代碼：

<?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/>"; 
    } 
    } 
} 

?>