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好像我在使用proc_open（）php函數時使用流傳輸到進程的流時遇到問題。在多個輸入流中使用php proc_open（）。防止掛起
我開始的過程只是轉換ImageMagick實用程序來組合3張圖像。當僅使用1輸入流（STDIN）和可變被轉儲到該流中的轉換程序正常工作並返回它的輸出，其可以被存儲在一個變量中，像這樣：
$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);
首先我運行轉換和將輸出存儲在$ ctext_opacity變量中。然後，將下一個命令通過稱爲proc_open（）和$ ctext_opacity可變用管道輸送槽的STDIN和用作輸入圖像：
$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);
}
上面的命令被稱爲3倍和3個獨立的圖像被生成並存儲在3個變量。下一個命令應該接受這3個變量作爲輸入圖像（ImageMagic語法指定替代io流，如fd：N，其中N是通過proc_open（）生成的流的編號）。不過，我似乎正在寫入輸入流或不正確地從STDOUT中讀取，這很可能導致進程的未刷新輸出導致它掛起而不終止。
$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();
}
}
我似乎無法作爲轉換引發錯誤空/不正確的數據