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@ 2014-04-01T11:05:35Z

<?php

$descriptorspec = array(
   0 => array("pipe", "r"),  // stdin is a pipe that the child will read from
   1 => array("pipe", "w"),  // stdout is a pipe that the child will write to
   2 => array("file", "NULL", "a") // stderr is a file to write to
);

$process = proc_open('ping -n 20 example.com', $descriptorspec, $pipes, getcwd(), $_ENV);

if (is_resource($process)) {
    // $pipes now looks like this:
    // 0 => writeable handle connected to child stdin
    // 1 => readable handle connected to child stdout
    // Any error output will be appended to /tmp/error-output.txt

    fwrite($pipes[0], '<?php print_r($_ENV); ?>');
    fclose($pipes[0]);

    echo stream_get_contents($pipes[1]);
    fclose($pipes[1]);

    // It is important that you close any pipes before calling
    // proc_close in order to avoid a deadlock
    $return_value = proc_close($process);

    echo "command returned $return_value\n";
}
?>

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Error: Call to undefined function proc_open() in /in/NnJRg:9 Stack trace: #0 {main} thrown in /in/NnJRg on line 9
Process exited with code 255.
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 7.4.33: Warning: proc_open(NULL): failed to open stream: Read-only file system in /in/NnJRg on line 9
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.32: Notice: Undefined variable: pipes in /in/NnJRg on line 9 Warning: proc_open() has been disabled for security reasons in /in/NnJRg on line 9
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2: Warning: proc_open(NULL): failed to open stream: Permission denied in /in/NnJRg on line 9
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9: Warning: proc_open() expects exactly 3 parameters, 5 given in /in/NnJRg on line 9

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