pcntl_fork

(PHP 4 >= 4.0.7, PHP 5)

pcntl_fork — Forks the currently running process

说明

int pcntl_fork ( void )

The pcntl_fork() function creates a child process that differs from the parent process only in its PID and PPID. Please see your system's fork(2) man page for specific details as to how fork works on your system.

返回值

On success, the PID of the child process is returned in the parent's thread of execution, and a 0 is returned in the child's thread of execution. On failure, a -1 will be returned in the parent's context, no child process will be created, and a PHP error is raised.

范例

Example#1 pcntl_fork() example


<?php

$pid = pcntl_fork();
if ($pid == -1) {
     die('could not fork');
} else if ($pid) {
     // we are the parent
     pcntl_wait($status); //Protect against Zombie children
} else {
     // we are the child
}

?>

参见

pcntl_waitpid()
pcntl_signal()


	PHP5中文手册 pcntl_exec pcntl_getpriority PCNTL PHP Manual pcntl_fork (PHP 4 >= 4.0.7, PHP 5) pcntl_fork — Forks the currently running process 说明 int pcntl_fork ( void ) The pcntl_fork() function creates a child process that differs from the parent process only in its PID and PPID. Please see your system's fork(2) man page for specific details as to how fork works on your system. 返回值 On success, the PID of the child process is returned in the parent's thread of execution, and a 0 is returned in the child's thread of execution. On failure, a -1 will be returned in the parent's context, no child process will be created, and a PHP error is raised. 范例 Example#1 pcntl_fork() example `<?php $pid = pcntl_fork(); if ($pid == -1) { die('could not fork'); } else if ($pid) { // we are the parent pcntl_wait($status); //Protect against Zombie children } else { // we are the child } ?>` 参见 pcntl_waitpid() pcntl_signal() pcntl_exec pcntl_getpriority PCNTL PHP Manual