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If a child as requested by process_id has already exited by the time of the call (a so-called "zombie" process), the function returns immediately. Any system resources used by the child are freed. Please see your system's waitpid (2) man page for specific details as to how waitpid works on your system.
Execute pcntl_waitpid Online. Info and examples on pcntl_waitpid PHP Function from Process Control - Process Control Extensions
Simple usage example of `pcntl_waitpid ()`. The pcntl_waitpid function in PHP is used to wait for a specific process to finish or to retrieve the status of a forked child process. It allows the parent process to wait until the child process completes its execution.
The pcntl_waitpid () function suspends execution of the current process until a child as specified by the pid argument has exited, or until a signal is delivered whose action is to terminate the current process or to call a signal handling function.
PCNTL_WAITPID is a PHP function used to wait for a child process to terminate. It takes two parameters, the first being the PID of the process to wait for, and the second being a variable to store the status of the child process.
Description The pcntl_waitpid of PCNTL for PHP waits on or returns the status of a forked child.
This documentation is intended to explain the general usage of each of the Process Control functions. For detailed information about Unix process control you are encouraged to consult your systems documentation including fork (2), waitpid (2) and signal (2) or a comprehensive reference such as Advanced Programming in the UNIX Environment by W. Richard Stevens (Addison-Wesley).
