php exec 返回的结果比直接进入命令行少

Question

I have an exec command that is behaving differently than the same command given to linux through Penguinet.

 $res = exec('cd /mnt/mydirectory/; zcat log_file.gz');
 echo $res

When putting the commands directly into the command line, I see about 100 entries in the log file. However when I access the PHP page that has the exec() command, I see only 1. And it is formatted correctly. Why does PHP show me only one result? How can I make it show the entire contents of the file?

EDIT:

Seems this is only returning only the last line. How can I change that?

Answer 1

try this:

exec('cd /mnt/mydirectory/; zcat log_file.gz', $res);
print_r($res);