线程环境中的PHP错误，将值分配给同一线程中的父静态成员

Question

我有这个问题，我想知道这是PHP错误还是故意的行为。如果我在子类中将MySQL资源分配给父成员，那么当作为线程运行时，该值就会丢失。

此代码不运行-MySQL资源应显示两次：

<?php
class MyFileAbstract extends Threaded
{
    protected static $m_Connection;
    public static function init() {
        static::openFile();
        echo "<br>Member accessed from parent: ";
        print_r(self::$m_Connection);   # the resource is empty
    }
}
class MyFile extends MyFileAbstract
{
    public static function openFile() {
        self::$m_Connection = fopen("/etc/php.ini", "r");
        echo "<br>Member accessed from child: ";
        print_r(self::$m_Connection)."<br>";   # the resource has value
    }
}
class MyThread extends Thread
{
    public function run() {
        MyFile::init();
    }
}
$myThread = new MyThread();
$myThread->start();
echo "<br>Correct output:";
MyFile::init();
?>

这是结果-"从父级访问的成员："的预期输出应该类似于"Resource id#2"：

Member accessed from child: Resource id #2
Member accessed from parent:
Correct output:
Member accessed from child: Resource id #3
Member accessed from parent: Resource id #3

我必须更改它，然后成员$m_Connection从fopen()接收/保留资源。注意：它正在线程中工作！

<?php
class MyFileAbstract extends Threaded
{
    protected static $m_Connection;
    public static function openFile()
    {
        $sFileName = static::getFileName();
        self::$m_Connection = fopen($sFileName, "r");
        echo "Member accessed from parent: ";
        print_r(self::$m_Connection);   # the resource has value
    }
}
class MyFile extends MyFileAbstract
{
    public static function getFileName()
    {
        return "/etc/php.ini";
    }
}
class MyThread extends Thread
{
    public function run()
    {
        MyFile::openFile();
    }
}
$myThread = new MyThread();
$myThread->start();
?>

输出：

Member accessed from parent: Resource id #2

运行示例的要求：

1. 在启用线程安全的情况下编译的PHP
2. 使用pThread库编译的PHP

根据这篇文章，我必须在线程中连接到MySql：http://php.net/manual/en/intro.pthreads.php

更新：

我更改了代码：它正在打开/etc/php.ini，而不是连接到MySql数据库。同样的结果-->从扩展类返回资源时会丢失资源。这些示例现在以1:1运行，没有更改/调整任何内容

Answer 1

我仍然认为这是一个bug。我现在找到了一个解决方法，当资源被显式分配给openFile()函数中的类成员为parent::而不是self:::时

<?php
class MyFileAbstract extends Threaded
{
    protected static $m_Connection;
    public static function init() {
        static::openFile();
        echo "<br>Member accessed from parent: ";
        print_r(self::$m_Connection);   # the resource is empty
    }
}
class MyFile extends MyFileAbstract
{
    public static function openFile() {
        # the resource keeps now the value when using parent:: instead of self::
        parent::$m_Connection = fopen("/etc/php.ini", "r");
        echo "<br>Member accessed from child: ";
        print_r(parent::$m_Connection)."<br>";
    }
}
class MyThread extends Thread
{
    public function run() {
        MyFile::init();
    }
}
$myThread = new MyThread();
$myThread->start();
echo "<br>Correct output:";
MyFile::init();
?>

现在的结果是正确的：

Member accessed from child: Resource id #2
Member accessed from parent: Resource id #2
Correct output:
Member accessed from child: Resource id #3
Member accessed from parent: Resource id #3