图像magick命令是否运行在多行?

I am trying a run an image magick commands which spans overs two lines for better readability. Will it run OK with PHP exec method? As an example, please have a look at following lines:

我正在尝试运行一个图像magick命令，它跨越两行，以获得更好的可读性。使用PHP exec方法运行OK吗?举个例子，请看以下几行:

exec("convert thumbnail.gif  autumn_leaves.png +swap 

        -gravity center -compose DstOver -composite 

        border_leaves.gif");

2 个解决方案

#1

This is how I write my code now for better readability:

这就是我现在写代码的方式，为了更好的可读性:

$cmd = "thumbnail.gif autumn_leaves.png +swap ".
" -gravity center -compose DstOver -composite ";

exec("convert $cmd border_leaves.gif");

This has an added benifit that if you are using variables in you code you can echo $cmd to view what the actual command is.

这有一个额外的好处，如果你在你的代码中使用变量，你可以echo $cmd来查看实际的命令是什么。

Another thought is if you write your code in blocks you can comment out blocks when fault finding to see where the code goes wrong.

另一个想法是，如果你把代码写在块中，你可以在错误发现的时候注释掉代码块，看看代码哪里出错了。

#2

Probably not. Instead of putting the new lines actually in the string, you could use concatenation so it looks like multiple lines but the final string is still one line:

可能不会。而不是把新行放到字符串中，你可以使用连接，这样它看起来就像多行，但最后一个字符串仍然是一行:

exec("convert thumbnail.gif  autumn_leaves.png +swap " .    
     "-gravity center -compose DstOver -composite " .
     "border_leaves.gif");

#1