What are some alternative methods to exec and passthru for opening external applications in PHP?

When opening external applications in PHP, using functions like exec and passthru can pose security risks as they allow for arbitrary command execution. To mitigate these risks, it is recommended to use alternative methods such as the `proc_open` function, which allows for more control over the process and input/output streams. 

$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", "/tmp/error-output.txt", "a") // stderr is a file to write to
);

$process = proc_open('your_external_command', $descriptorspec, $pipes);

if (is_resource($process)) {
    fwrite($pipes[0], $input);
    fclose($pipes[0]);

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

    $return_value = proc_close($process);
}

Keywords

exec passthru shell_exec proc_open popen

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