PHP exec $PATH variable missing elements

问题

When I echo $PATH on my command line, it returns

/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/Applications/MAMP/Library/bin:/usr/local/git/bin:/usr/X11/bin

When I execute this php code

exec('echo $PATH; whoami; less /etc/paths; 2>&1')

I get

string 'echo $PATH; whoami; less /etc/paths; 2>&1' (length=56)
array
  0 => string '/usr/bin:/bin:/usr/sbin:/sbin' (length=29)
  1 => string 'eric' (length=4)
  2 => string '/usr/bin' (length=8)
  3 => string '/bin' (length=4)
  4 => string '/usr/sbin' (length=9)
  5 => string '/sbin' (length=5)
  6 => string '/usr/local/bin' (length=14)
  7 => string '/Applications/MAMP/Library/bin' (length=30)
  8 => string '/usr/bin:/bin:/usr/sbin:/sbin' (length=29)

This is on Mac OS X. Can anyone tell me why my last two path elements are missing?

回答1:

Environment variables on Mac OS X are set by differing mechanisms depending on how your code, or its parent process, was launched. To insure that items launched from an interactive shell and items launched by the WindowServer have the same path, you need to keep ~/.MacOSX/environment.plist in sync with what is set in .profile (or .cshrc).

回答2:

Try executing this before you call exec:

putenv("PATH=" .$_ENV["PATH"]. ':/usr/local/git/bin:/usr/X11/bin');

回答3:

What does:

php -r 'print getenv("PATH");'

give you?

It's likely the shell that PHP spawns (probably sh instead of bash) isn't getting the same environment that you have at the command line. You don't say how you're running your exec command.

This will show you which shell is being run:

php -r 'echo shell_exec("echo $0");'

You may need to use the putenv command or determine whether your path needs to be set in /etc/profile, ~/.profile or ~/.bashrc in order for it to be picked up.

来源：https://stackoverflow.com/questions/3428647/php-exec-path-variable-missing-elements

标签

php

bash

path

environment-variables

exec