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    pcntl_exec

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

    pcntl_exec — 現在のプロセス空間で指定したプログラムを実行する

    説明

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

    指定した引数でプログラムを実行します。

    パラメータ

    path

    path は、バイナリ実行ファイルへのパスか、 あるいは有効な実行ファイルを指す shebang (例: #!/usr/local/bin/perl) が一行目に存在するスクリプトへのパスである必要があります。 詳細な情報については、システムの man ページで execve(2) を参照ください。

    args

    args は、プログラムに渡す引数文字列の配列です。

    env_vars

    env_vars は、プログラムに渡す環境変数の配列です。 この配列は name => value のような形式で、key が環境変数名・value が その値となります。

    戻り値

    Returns false.

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    User Contributed Notes 3 notes

    up
    12
    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.
    up
    10
    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.
    up
    3
    rbemrose at vgmusic dot com
    16 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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