PHP 脚本在超过 60 秒时执行两次

Question

好吧，在过去的 3 个小时里，我一直在为这个问题绞尽脑汁，疯狂地进行谷歌搜索，但没有解决这个问题。因此，我编写了一个示例脚本来重现此内容，因为我的原始脚本大约有 800 行。

<?php
    set_time_limit(0);
    ini_set('max_input_time', '-1');
    ini_set('max_execution_time', '0');

    error_log("executing script... ");
    $time = time();
    for ($t = 0; $t <= 15; $t++) {
        error_log("Logging: $t (".(time()-$time)." seconds)");
        sleep(5);
    }
    error_log("execution done (".(time()-$time)." seconds)");
?>

现在， sleep 函数只是用来重新创建页面的执行时间，并没有在原始代码中使用。这将在 error_log 文件中产生以下结果

[Tue Nov 06 16:24:14 2012] executing script...
[Tue Nov 06 16:24:14 2012] Logging: 0 (0 seconds)
[Tue Nov 06 16:24:19 2012] Logging: 1 (5 seconds)
[Tue Nov 06 16:24:24 2012] Logging: 2 (10 seconds)
[Tue Nov 06 16:24:29 2012] Logging: 3 (15 seconds)
[Tue Nov 06 16:24:34 2012] Logging: 4 (20 seconds)
[Tue Nov 06 16:24:39 2012] Logging: 5 (25 seconds)
[Tue Nov 06 16:24:44 2012] Logging: 6 (30 seconds)
[Tue Nov 06 16:24:49 2012] Logging: 7 (35 seconds)
[Tue Nov 06 16:24:54 2012] Logging: 8 (40 seconds)
[Tue Nov 06 16:24:59 2012] Logging: 9 (45 seconds)
[Tue Nov 06 16:25:04 2012] Logging: 10 (50 seconds)
[Tue Nov 06 16:25:09 2012] Logging: 11 (55 seconds)
[Tue Nov 06 16:25:14 2012] executing script...
[Tue Nov 06 16:25:14 2012] Logging: 0 (0 seconds)
[Tue Nov 06 16:25:14 2012] Logging: 12 (60 seconds)
[Tue Nov 06 16:25:19 2012] Logging: 1 (5 seconds)
[Tue Nov 06 16:25:19 2012] Logging: 13 (65 seconds)
[Tue Nov 06 16:25:24 2012] Logging: 2 (10 seconds)
[Tue Nov 06 16:25:24 2012] Logging: 14 (70 seconds)
[Tue Nov 06 16:25:29 2012] Logging: 3 (15 seconds)
[Tue Nov 06 16:25:29 2012] Logging: 15 (75 seconds)
[Tue Nov 06 16:25:34 2012] Logging: 4 (20 seconds)
[Tue Nov 06 16:25:34 2012] execution done (80 seconds)
[Tue Nov 06 16:25:39 2012] Logging: 5 (25 seconds)
[Tue Nov 06 16:25:44 2012] Logging: 6 (30 seconds)
[Tue Nov 06 16:25:49 2012] Logging: 7 (35 seconds)
[Tue Nov 06 16:25:54 2012] Logging: 8 (40 seconds)
[Tue Nov 06 16:25:59 2012] Logging: 9 (45 seconds)
[Tue Nov 06 16:26:04 2012] Logging: 10 (50 seconds)
[Tue Nov 06 16:26:09 2012] Logging: 11 (55 seconds)
[Tue Nov 06 16:26:14 2012] Logging: 12 (60 seconds)
[Tue Nov 06 16:26:19 2012] Logging: 13 (65 seconds)
[Tue Nov 06 16:26:24 2012] Logging: 14 (70 seconds)
[Tue Nov 06 16:26:29 2012] Logging: 15 (75 seconds)
[Tue Nov 06 16:26:34 2012] execution done (80 seconds)

这里有一些来自 phpinfo 的相关设置

=== apache2handler ===
Max Requests: Per Child: 1000 - Keep Alive: on - Max Per Connection: 200
Timeouts: Connection: 300 - Keep-Alive: 2 

=== PHP Version 5.4.5 Core Settings ===
max_execution_time     Local: 0     Master: 30
max_input_time         Local: -1    Master: -1

我已经尝试了所有我能想到的。它似乎是使用 Apache 或 PHP 的服务器设置，因为当我在我的本地主机上运行相同的脚本时，它会成功执行，就像它应该没有双重加载一样。在询问之前，是的，每次我更改 INI 或更改 Apache 配置时，我都会重新启动 Apache。

此外，这里是上述示例的 access_log 条目。

*.*.*.* - - [06/Nov/2012:16:43:56 -0700] "GET /test.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0" *.*.*.* *********.com 80 55050278 1012 321 *.*.*.*
*.*.*.* - - [06/Nov/2012:16:44:56 -0700] "GET /test.php HTTP/1.1" 200 20 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0" *.*.*.* *********.com 80 60054985 1012 321 *.*.*.*

一旦执行时间达到 60 秒，肯定会执行此操作，因为当我将执行时间更改为 55 秒时，它会正常运行一次。

[Tue Nov 06 16:46:00 2012] executing script...
[Tue Nov 06 16:46:00 2012] Logging: 0 (0 seconds)
[Tue Nov 06 16:46:05 2012] Logging: 1 (5 seconds)
[Tue Nov 06 16:46:10 2012] Logging: 2 (10 seconds)
[Tue Nov 06 16:46:15 2012] Logging: 3 (15 seconds)
[Tue Nov 06 16:46:20 2012] Logging: 4 (20 seconds)
[Tue Nov 06 16:46:25 2012] Logging: 5 (25 seconds)
[Tue Nov 06 16:46:30 2012] Logging: 6 (30 seconds)
[Tue Nov 06 16:46:35 2012] Logging: 7 (35 seconds)
[Tue Nov 06 16:46:40 2012] Logging: 8 (40 seconds)
[Tue Nov 06 16:46:45 2012] Logging: 9 (45 seconds)
[Tue Nov 06 16:46:50 2012] Logging: 10 (50 seconds)
[Tue Nov 06 16:46:55 2012] execution done (55 seconds)

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Answer 1

可能是缺少网站图标之类的东西导致您的脚本被调用两次。参见 http://www.webdeveloper.com/forum/showthread.php?245809-Script-Running-Twice .如果您将非 www 重定向到 www，反之亦然，也会发生这种情况。参见 PHP executes twice on page load when redirecting from non-www to www