php pcntl_fork() 返回，致命错误：调用未定义的函数 pcntl_fork()
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pcntl_fork() returning, Fatal error: Call to undefined function pcntl_fork()
提问by Ben Pearce
I'm trying to fork a command line run XAMPP php process using pcntl_fork(). When I run the command below:
我正在尝试使用 pcntl_fork() fork 命令行运行 XAMPP php 进程。当我运行以下命令时：
$pid = pcntl_fork();
if($pid == -1){
file_put_contents('testlog.log',"\r\nFork Test",FILE_APPEND);
return 1; //error
}
else if($pid){
return 0; //success
}
else{
file_put_contents($log, 'Running...', FILE_APPEND);
}
I get:
我得到：
Fatal error: Call to undefined function pcntl_fork()
Can anyone suggest how to fix this?
谁能建议如何解决这个问题？
回答by Andrea
It is not possible to use the function 'pcntl_fork' when PHP is used as Apache module (such as XAMPP). You can only use pcntl_fork in CGI mode or from command-line.
当 PHP 用作 Apache 模块（例如 XAMPP）时，无法使用函数 'pcntl_fork'。您只能在 CGI 模式下或从命令行使用 pcntl_fork。
Using this function will result in: 'Fatal error: Call to undefined function: pcntl_fork()'
使用此函数将导致： 'Fatal error: Call to undefined function: pcntl_fork()'
回答by Stuart Carnie
To see if it is installed, run:
要查看它是否已安装，请运行：
php -i | grep pcntl
php -i | grep pcntl
If it is present and enabled then the pcntl function are likely disabled, which appears to be the default in newer PHP 5.x installs. To check, run:
如果它存在并启用，则 pcntl 功能可能被禁用，这似乎是较新的 PHP 5.x 安装中的默认设置。要检查，请运行：
php -i | grep disable_functions
php -i | grep disable_functions
If you see a list of pcntl_* functions, you'll need to edit your php.ini file (inside of XAMPP) and comment out the line disable_functions=
如果您看到 pcntl_* 函数列表，则需要编辑 php.ini 文件（在 XAMPP 内）并注释掉该行 disable_functions=
I'd recommend you use this distributionof PHP for OS X, which has current versions and I can confirm does have the pcntlextension.
回答by Nabi K.A.Z.
pcntl_*functions, Process Control support in PHP is not enabled by default. You have to compile the CGI or CLI version (don't used as Apache module) of PHP with --enable-pcntlconfiguration option when compiling PHP to enable Process Control support.
pcntl_*功能，PHP 中的进程控制支持默认不启用。--enable-pcntl在编译 PHP 以启用进程控制支持时，您必须使用配置选项编译 PHP的 CGI 或 CLI 版本（不要用作 Apache 模块）。
Currently, this module will not function on non-Unix platforms(Windows).
目前，该模块在非 Unix 平台(Windows)上不起作用。
回答by JVE999
I had the same issue when running the script as a part of Apache. So, my solution was to put the code containing pcntl_forkin a different file (let's call it fork.php) and use exec()to run it, like this:
作为 Apache 的一部分运行脚本时，我遇到了同样的问题。所以，我的解决方案是将包含pcntl_fork在不同文件中的代码（让我们称之为fork.php）并使用exec()它来运行它，如下所示：
mainFile.php (this is what Apache will run)
mainFile.php（这是 Apache 将运行的）
exec('php fork.php',$output);
fork.php
叉子.php
$pid = pcntl_fork();
if($pid == -1){
file_put_contents('testlog.log',"\r\nFork Test",FILE_APPEND);
return 1; //error
}
else if($pid){
return 0; //success
}
else{
file_put_contents($log, 'Running...', FILE_APPEND);
}
