Question

我正在寻找一种解决方案，允许PHP脚本在出现提示时发送多个命令。从shell执行以下代码时：

root@host [~]# /usr/local/bin/grads-2.0.2/bin/grads -b

此输出结果：

Grid Analysis and Display System (GrADS) Version 2.0.2
Copyright (c) 1988-2011 by Brian Doty and the
Institute for Global Environment and Society (IGES)
GrADS comes with ABSOLUTELY NO WARRANTY
See file COPYRIGHT for more information

Config: v2.0.2 little-endian readline printim grib2 netcdf hdf4-sds hdf5 opendap-grids,stn geotiff shapefile
Issue 'q config' command for more detailed configuration information
Landscape mode? ('n' for portrait):

如您所见，脚本正在等待y / n输入。输入y / n时，将产生以下输出结果：

Landscape mode? ('n' for portrait):  y
GX Package Initialization: Size = 11 8.5 
Running in Batch mode
ga->

然后脚本会等待任何进一步的命令，直到它可以退出＆＃39;退出＆＃39;命令。＆＃39;退出＆＃39;得到以下结果：

ga-> quit
No hardcopy metafile open
GX package terminated 
root@host [~]#

当我尝试通过PHP执行此操作时，我的问题就出现了。我的代码如下：

$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
);
$cwd = '/';
$process = proc_open('/usr/local/bin/grads-2.0.2/bin/grads -b', $descriptorspec, $pipes, $cwd);
if (is_resource($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], 'y');
    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);
}

但是，这是一次输出：

Grid Analysis and Display System (GrADS) Version 2.0.2
Copyright (c) 1988-2011 by Brian Doty and the
Institute for Global Environment and Society (IGES)
GrADS comes with ABSOLUTELY NO WARRANTY
See file COPYRIGHT for more information

Config: v2.0.2 little-endian readline printim grib2 netcdf hdf4-sds hdf5 opendap-grids,stn geotiff shapefile
Issue 'q config' command for more detailed configuration information
Landscape mode? ('n' for portrait):  GX Package Initialization: Size = 11 8.5 
Running in Batch mode
ga-> [EOF]
No hardcopy metafile open
GX package terminated

正如您所看到的，脚本正在竞争而不等待输入...我需要对PHP代码进行哪些修改才能解决此问题？任何帮助将不胜感激...我的命令在命令行工作正常，所以这是我的应用程序的唯一回复。

Answer 1

我无法帮助PHP，但是如果你使用“-blx”而不是“-b”调用grads，那么它将自动以横向模式启动，并在命令完成时退出。当GrADS询问Landscape模式时，-l消除了用户输入的需要，-x告诉它在完成时退出。您可以添加'c'，后跟命令或脚本的名称。例如：

# /usr/local/bin/grads -blxc 'q config'

将以横向模式启动Grads，执行打印配置信息的命令，然后退出。命令'q config'可以替换为脚本的名称。有关GrADS命令行选项的文档位于http://iges.org/grads/gadoc/gradcomdgrads.html

等待PHP的shell脚本命令行输入

1 个答案: