无法在Ubuntu上通过PHP执行Java jar文件

Question

Here is my PHP code:

<?php
exec('java -jar ~/src/epubcheck-*/epubcheck-*.jar -out /var/www/epubcheck-outputs/output.xml /var/www/AChristmasCarol.epub');

When I try the command in the terminal it works... But in PHP it does not.

Also I don't even get the java version. But I do get to see the "hey..." so some commands do work, others don't.

I am using NGiNX has my server.

Answer 1

The documentation for exec explains that only the last line of the output is returned by exec, so you need to use a parameter to capture the full output.

java -version sends its output to STDERR , not STDOUT , so you need to redirect STDERR to STDOUT if you want to capture the output of that command with PHP. However, this shouldn't be necessary when you're running an ordinary java program.

$output = array();

exec('java -version 2>&1', $output);
print_r($output); // contains the correct output

exec('java -jar myfile.jar', $output);
print_r($output); // should also contain the correct output

If this still doesn't work, see my comment on Ibu's answer

Edit: Actual answer, from question comments:

~/src/epubcheck-*/epubcheck-*.jar could be a problem here - ~ is a shortcut for the home directory of the current user - so when you run the command yourself, it means /home/username/src/... , but when you run it as your webserver's user, it means an entirely different path. Try changing that to the full path of the jar files you want to execute.

Answer 2

On the php manual it says that passthru returns void:

void passthru ( string $command [, int &$return_var ] )

So nothing will be echoed.