Question

我目前在我的数据库中生成大约34k引脚/ auths，当我运行它时，它只是说This webpage is not available并说apache崩溃了。我不确定是什么导致它崩溃，因为它到目前为止产生了34k而没有问题。如果我能得到关于导致我的脚本崩溃的指针或任何内容，那就太棒了。谢谢。我也在本地wamp服务器上运行它。所以它给了我一个apache崩溃弹出窗口，但我似乎无法让它再次显示。

编辑这是崩溃弹出信息：

C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_httpd.exe_7bb4b47e7db260ba266dfdf76b7ba24f8a5e099_cab_175bb644\WERB55A.tmp.appcompat.txt C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_httpd.exe_7bb4b47e7db260ba266dfdf76b7ba24f8a5e099_cab_175bb644\WERB56A.tmp.WERInternalMetadata.xml C:\ProgramData\Microsoft\Windows\WER\ReportQueue\AppCrash_httpd.exe_7bb4b47e7db260ba266dfdf76b7ba24f8a5e099_cab_175bb644\WERB5E9.tmp.mdmp

错误日志：

[Sat Apr 12 19:17:01.362346 2014] [core:notice] [pid 3124:tid 412] AH00094: Command line: 'c:\\wamp\\bin\\apache\\apache2.4.4\\bin\\httpd.exe -d C:/wamp/bin/apache/Apache2.4.4' [Sat Apr 12 19:17:01.363346 2014] [mpm_winnt:notice] [pid 3124:tid 412] AH00418: Parent: Created child process 940 [Sat Apr 12 19:17:01.599360 2014] [mpm_winnt:notice] [pid 940:tid 308] AH00354: Child: Starting 150 worker threads. [Sat Apr 12 19:17:04.302514 2014] [mpm_winnt:notice] [pid 3124:tid 412] AH00428: Parent: child process 940 exited with status 255 -- Restarting. [Sat Apr 12 19:17:04.389519 2014] [mpm_winnt:notice] [pid 3124:tid 412] AH00455: Apache/2.4.4 (Win64) PHP/5.4.12 configured -- resuming normal operations [Sat Apr 12 19:17:04.389519 2014] [mpm_winnt:notice] [pid 3124:tid 412] AH00456: Server built: Feb 22 2013 22:08:37 [Sat Apr 12 19:17:04.389519 2014] [core:notice] [pid 3124:tid 412] AH00094: Command line: 'c:\\wamp\\bin\\apache\\apache2.4.4\\bin\\httpd.exe -d C:/wamp/bin/apache/Apache2.4.4' [Sat Apr 12 19:17:04.391519 2014] [mpm_winnt:notice] [pid 3124:tid 412] AH00418: Parent: Created child process 2996 [Sat Apr 12 19:17:04.647534 2014] [mpm_winnt:notice] [pid 2996:tid 308] AH00354: Child: Starting 150 worker threads.

代码：

<?php
    ini_set('xdebug.max_nesting_level', 1000000); //this is to fix the recursion?
    ini_set('max_execution_time', 3000000); //300 seconds = 5 minutes
    ini_set('memory_limit', -1);
    ini_set('error_reporting', E_ALL);
    //Enter your database connection details here.
    $host = 'localhost';
    $db_name = 'pins'; 
    $db_username = 'root';
    $db_password = ''; 
    date_default_timezone_set('America/Los_Angeles');
    try
    {
        $pdo = new PDO('mysql:host='. $host .';dbname='.$db_name, $db_username, $db_password);
    }
    catch (PDOException $e)
    {
        exit('Error Connecting To DataBase');
    }
    $starttime = microtime(true);
    class lists
    {
        public $pdo;
        function __construct($pdo)
        {
            $this->pdo = $pdo;
        }
        function duplicateCode($code)
        {
            $query = $this->pdo->prepare("SELECT 1 FROM pins WHERE pins_pin = ?");
            $query->bindValue(1, $code);
            $query->execute();
            return $query->fetch();
        }
        function generateCode()
        {
            $code = "AA" . substr(str_shuffle('0123456789'), 0, 8);
            if($this->duplicateCode($code))
            {
                return $this->generateCode();
            }
            else
            {
                return $code;
            }
        }   
        function generatePin($code)
        {
            $query = $this->pdo->prepare("INSERT INTO pins (pins_pin) VALUES (?)");
            $query->bindValue(1, $code);
            $query->execute();
            return;
        }
    }
    function post_to_url($url, $data) {
        $fields = '';
        foreach ($data as $key => $value) {
            $fields .= $key . '=' . $value . '&';
        }
        rtrim($fields, '&');

        $post = curl_init();

        curl_setopt($post, CURLOPT_URL, $url);
        curl_setopt($post, CURLOPT_POST, count($data));
        curl_setopt($post, CURLOPT_POSTFIELDS, $fields);
        curl_setopt($post, CURLOPT_RETURNTRANSFER, 1);

        $result = curl_exec($post);

        curl_close($post);
        return $result;
    }
    $list = new lists($pdo);
    for($i = 0; $i < 100000; $i++)
    {
        $code = $list->generateCode();
        $pin = $list->generatePin($code);
    }
    $endtime = microtime(true);
    $duration = $endtime - $starttime; //calculates total time taken
    echo $duration;
?>

Answer 1

重复调用lists::generateCode()可能会超出内部递归限制。

一个简单的解决方法是消除递归：

function generateCode()
{
    do {
        $code = "AA" . substr(str_shuffle('0123456789'), 0, 8);
    } while ($this->duplicateCode($code));
    return $code;
}

然而，这里有一个更基本的问题。您的代码生成的代码以两个As开头，然后包含6个数字，所有代码必须不同。只有10! ÷ (10 - 6)! = 151,200个可能的代码符合这种模式 - 一旦你生成了所有这些代码，就不会再有了，甚至这个纠正的代码也会无休止地循环。（另外，如果str_shuffle()没有访问所有可能的排列 - 这是完全可能的 - 那么可能的输出集将会比这更小。）

除非您要求所有六位数字都不同，否则我强烈建议您改为使用任何六位数的序列，例如：

  $code = sprintf("AA%06d", rand(0, 999999));

Apache在执行我的PHP脚本时崩溃了

1 个答案: