PHP 執行外部指令

<?php
echo "<pre>";

ob_implicit_flush(true);
ob_end_flush();

$cmd = "./1.sh";

$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("pipe", "w")    // stderr is a pipe that the child will write to
);

$process = proc_open($cmd, $descriptorspec, $pipes, realpath('./'), array());
if (is_resource($process)) while ($s = fgets($pipes[1])) print $s;
?>