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好像我在使用proc_open（）php函数时使用流传输到进程的流时遇到问题。在多个输入流中使用php proc_open（）。防止挂起
我开始的过程只是转换ImageMagick实用程序来组合3张图像。当仅使用1输入流（STDIN）和可变被转储到该流中的转换程序正常工作并返回它的输出，其可以被存储在一个变量中，像这样：
$cmd = BIN_PATH.DIRECTORY_SEPARATOR.'convert ';
$cmd .= ' -size SOMESIZE ';
$cmd .= ' -background black ';
$cmd .= ' -fill white ';
$cmd .= ' -stroke none ';
$cmd .= ' -gravity center ';
$cmd .= ' -trim ';
$cmd .= ' -interline-spacing SOMELINEHEIGHT ';
$cmd .= ' -font SOMEFONT ';
$cmd .= ' label:"SOMETEXT" ';
$cmd .= ' miff:- ';
$ctext_opacity = shell_exec($cmd);
首先我运行转换和将输出存储在$ ctext_opacity变量中。然后，将下一个命令通过称为proc_open（）和$ ctext_opacity可变用管道输送槽的STDIN和用作输入图像：
$cmd = BIN_PATH.DIRECTORY_SEPARATOR.'convert ';
$cmd .= '-size SOMESIZE ';
$cmd .= ' xc:\'rgb(230, 225, 50)\' ';
$cmd .= ' -gravity center ';
$cmd .= ' - '; // ImageMagick uses dash(-) for STDIN
$cmd .= ' -alpha Off ';
$cmd .= ' -compose CopyOpacity ';
$cmd .= ' -composite ';
$cmd .= ' -trim ';
$cmd .= ' miff:- ';
$chighlight = '';
$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w")
);
$process = proc_open($cmd, $descriptorspec, $pipes);
if (is_resource($process)) {
fwrite($pipes[0], $ctext_opacity);
fclose($pipes[0]);
while (!feof($pipes[1])) {
$chighlight .= fgets($pipes[1]); // HERE WE FEED THE OUTPUT OF "CONVERT" TO $chighlight
}
//echo $chighlight; die();
fclose($pipes[1]);
$return_value = proc_close($process);
}
上面的命令被称为3倍和3个独立的图像被生成并存储在3个变量。下一个命令应该接受这3个变量作为输入图像（ImageMagic语法指定替代io流，如fd：N，其中N是通过proc_open（）生成的流的编号）。不过，我似乎正在写入输入流或不正确地从STDOUT中读取，这很可能导致进程的未刷新输出导致它挂起而不终止。
$cmd = BIN_PATH.DIRECTORY_SEPARATOR.'convert ';
$cmd .= ' -size SOMESIZE ';
$cmd .= ' xc:transparent ';
$cmd .= ' -gravity center ';
$cmd .= ' - -geometry -2-2 -composite ';
$cmd .= ' fd:3 -geometry +2+2 -composite ';
$cmd .= ' fd:4 -composite ';
$cmd .= 'png:- ';
$descriptorspec = array(
0 => array("pipe", "r"),
1 => array("pipe", "w"),
2 => array("pipe", "a"),
3 => array("pipe", "r"),
4 => array("pipe", "r")
);
$process = proc_open($cmd, $descriptorspec, $pipes);
if (is_resource($process)) {
$read = null;
$rd = array($pipes[1]);
$write = array($pipes[0], $pipes[3], $pipes[4]);
$wt = array($pipes[0], $pipes[3], $pipes[4]);
$im_args = array($cshade, $chighlight, $ctext);
$except = null;
$readTimeout = 1;
$ctext_deboss = '';
$numchanged = stream_select($read, $write, $except, $readTimeout);
foreach($write as $w) {
$key = array_search($w, $wt);
fwrite($wt[$key], $im_args[$key]);
fclose($wt[$key]);
$read = array($pipes[1]);
$rd = array($pipes[1]);
$write = null;
$except = null;
$readTimeout = 1;
$ctext_deboss = '';
$numchanged = stream_select($read, $write, $except, $readTimeout);
foreach($read as $r) {
while (!feof($r)) {
$ctext_deboss .= fgets($pipes[1]);
}
}
fclose($pipes[1]);
$return_value = proc_close($process);
echo $ctext_deboss; die();
}
}
我似乎无法作为转换引发错误空/不正确的数据