https://jackxiang.com/index.php zh-cn https://jackxiang.com/post// jack <xdy108@126.com> Tue, 03 Nov 2020 06:30:48 +0000 https://jackxiang.com/post// 怎么办：实际上Swoole提供的System::exec()行为上与PHP的shell_exec是完全一致的，我们写一个shell_exec的同步阻塞版本，执行后发现同样拿不到标准错误流输出的内容，会被直接打印到屏幕。
答案：  使用proc_open+hook实现。
现象：
<?php $result = shell_exec('unknown'); var_dump($result);

==================================================================
#php tt.php
PHP Warning:  shell_exec() has been disabled for security reasons in /data/www/testswoole/tt.php on line 2
NULL

估计整成错误输出了，于是用：
php tt.php >/dev/null 2>&1

果然，怎么办？加入管道，将此错误指向新的文件描述符。



前置：打开php.ini里面的proc_open禁用函数。
#cat t.php
<?php Swoole\Runtime::setHookFlags(SWOOLE_HOOK_ALL); Swoole\Coroutine\run(function () {     $descriptorspec = array(         0 => array("pipe", "r"),         1 => array("pipe", "w"),         2 => array("pipe", "w"),     );     $process = proc_open('unknown', $descriptorspec, $pipes);     var_dump($pipes);     var_dump(fread($pipes[2], 8192));     $return_value = proc_close($process);     echo "command returned $return_value\n"; });

#php t.php
array(3) {
  [0]=>
  resource(4) of type (stream)
  [1]=>
  resource(5) of type (stream)
  [2]=>
  resource(6) of type (stream)
}
string(31) "sh: unknown: command not found
"
command returned 32512

代码来自rango：https://mp.weixin.qq.com/s/z7SPy-tV3hsQqLXZ-tKlZw ]]> https://jackxiang.com/post//#blogcomment <user@domain.com> Thu, 01 Jan 1970 00:00:00 +0000 https://jackxiang.com/post//#blogcomment