pcntl_exec

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pcntl_exec在当前进程空间执行指定程序

说明

pcntl_exec(string $path, array $args = [], array $env_vars = []): bool

以给定参数执行程序。

参数

path

path 必须时可执行二进制文件路径或一个在文件第一行指定了 一个可执行文件路径标头的脚本(比如文件第一行是 #!/usr/local/bin/perl 的 perl 脚本)。 更多的信息请查看您系统的 execve(2)手册。

args

args 是一个要传递给程序的参数的字符串数组。

env_vars

env_vars 是一个要传递给程序作为环境变量的字符串数组。这个数组是 key => value 格式的,key 代表要传递的环境变量的名称,value 代表该环境变量值。

返回值

返回 false

添加备注

用户贡献的备注 3 notes

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12
agodong at verizon dot net
18 years ago
Some people might find it useful to run other program using the same process as a different user. This is very usefull if the script is running under root. Here is a simple code to achieve that under *nix PHP CLI:

#!/usr/bin/php -q
<?php
//Enter run-as user below (argument needed to be passed when the script is called), otherwise it will run as the caller user process.

$username = $_SERVER['argv'][1];

$user = posix_getpwnam($username);
posix_setuid($user['uid']);
posix_setgid($user['gid']);
pcntl_exec('/path/to/cmd');
?>

I use this as a part of socket program so that a program can be run under different user from remote location.
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11
eric kilfoil
18 years ago
The pcntl_exec() function works exactly like the standard (unix-style) exec() function. It differs from the regular PHP exec() function in that the process calling the pcntl_exec() is replaced with the process that gets called. This is the ideal method for creating children. In a simple example (that does no error checking):

switch (pcntl_fork()) {
case 0:
$cmd = "/path/to/command";
$args = array("arg1", "arg2");
pcntl_exec($cmd, $args);
// the child will only reach this point on exec failure,
// because execution shifts to the pcntl_exec()ed command
exit(0);
default:
break;
}

// parent continues
echo "I am the parent";

--

since this is not being executed through a shell, you must provide the exact path from the filesystem root. Look at the execve() man page for more information.
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2
rbemrose at vgmusic dot com
17 years ago
As a side note, if I'm reading the comments below correctly, you should not run this if you're using a PHP webserver module, as it will replace the webserver's process with whatever process you're telling it to run.
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