How to convert .bat code to .php code

I want use webscreencapture to make a web screenshot. if I save the below code in a screenshot.bat, and then click it, it can catch the two web screenshots.

webscreencapture.exe http://www.youtube.com/watch?v=SLyG0mUnw4A e:\www\111\1.jpg
webscreencapture.exe http://www.youtube.com/watch?v=izUxI-k01CU e:\www\111\2.jpg

Now I want to convert .bat code to .php code. I use:

<?php
$cmd = 'webscreencapture.ex开发者_Go百科e http://www.youtube.com/watch?v=SLyG0mUnw4A e:\www\111\1.jpg';
sleep(1);
$cmd = 'webscreencapture.exe http://www.youtube.com/watch?v=izUxI-k01CU e:\www\111\1.jpg';
system($cmd);
?>

It just gets the second web screenshot. It doesn't seem to run the first command. Where's the problem? Thanks.

By the way, webscreencapture can not set a time delay, and can not screenshot a youtube movie. Can anyone recommend something that can?

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You don't execute your first $cmd. You just replace it after sleeping for a second.

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Your assigning cmd to the new string before even calling the first command. Also, the filenames appear to be the same.

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You never actually bother ever calling the first command. You have to call system($cmd) after assigning the variable.

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Well, the main problem seems to be that you only call system($cmd) once.

$cmd is just a variable that contains the command to call. The system($cmd) is what actually executes it.