Executing Background Processes in PHP

Executing time-consuming processes, such as directory copying, without stalling the user experience can be a challenge. This article introduces a solution that enables such tasks to run in the background.

Background Process Execution

To initiate a directory copy without user interruption, consider the following steps:

1. Use exec() to Launch the Command:
   Employ exec to启动复制命令，将输出重定向到文件（$ outputfile），然后将进程ID附加到另一个文件（$ pidfile）。 This ensures continuous monitoring.

   exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, $outputfile, $pidfile));

2. Monitor Process Status:
   Implement the isRunning function to track the process's status based on its pid。

   函数isRunning（$ pid）{ 尝试{ $ result = shell_exec（sprintf（“ ps％d”，$ pid））; if（count（preg_split（“/\ n/”，$ result））> 2）{ 返回true; } } catch（异常$ e）{} 返回false; } [2