在 php 中运行 shell_exec 会导致 Web 服务器挂起
我正在运行以下代码。它的作用是获取一个文本文件，将其分割成以“_part”结尾的部分，然后调用带有标志的相同脚本来处理文件 - 将内容上传到 Drupal 系统。
发生的情况是脚本运行并完成工作，所有调用的脚本也完成，我可以看到结果。但每次运行后，网络服务器都会停止响应。我有什么基本的遗漏或做错了吗？
if(isset($argv[3])){
$isSplit = $argv[3] == 'true' ? true : false;
}
if($isSplit){
$fileSplitter = new CSVFileParts($fileName);
$parts = $fileSplitter->split_file();
echo 'Splited file to '.$parts.' parts'.PHP_EOL;
for($part =0; $part < $parts; $part++){
echo shell_exec('php Service.php u ./partial_files/'.basename($fileName).'.part_'.$part.' false > /dev/null 2>/dev/null &');
}
}else{
$log->lwrite('uploading '.$argv[2]);
$drupalUploader = new DrupalUploader($fileName, $log);
$drupalUploader->upload();
}
I am running the following code. What it does is take a text file, splits it into parts that end with '_part' ending and than calls the same script with a flag to process the files - uploading the content to a Drupal system.
What happens is that the script runs and finishes the work, all invoked scripts finish too and I can see the results. but each time after I run it the web server stops responding. Is there anything basic that I am missing or doing wrong?
if(isset($argv[3])){
$isSplit = $argv[3] == 'true' ? true : false;
}
if($isSplit){
$fileSplitter = new CSVFileParts($fileName);
$parts = $fileSplitter->split_file();
echo 'Splited file to '.$parts.' parts'.PHP_EOL;
for($part =0; $part < $parts; $part++){
echo shell_exec('php Service.php u ./partial_files/'.basename($fileName).'.part_'.$part.' false > /dev/null 2>/dev/null &');
}
}else{
$log->lwrite('uploading '.$argv[2]);
$drupalUploader = new DrupalUploader($fileName, $log);
$drupalUploader->upload();
}
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shell_exec — 通过 shell 执行命令并以字符串形式返回完整的输出shell_exec 期望文件句柄打开，但您将所有内容重定向到 /dev/null 并将其分离。
当您计划分离进程并删除所有输出时，您应该使用 exec() 和 escapeshellcmd()
请参阅： http://www.php.net/manual/en/function.exec.php
shell_exec — Execute command via shell and return the complete output as a stringshell_exec expects the file handle to be open, but you redirect everything to /dev/null and detach it.
As you plan to detach the process and remove all the output, you should use exec() and escapeshellcmd()
see: http://www.php.net/manual/en/function.exec.php