wp-cli/wp-cli — pull request #1407 by xslidian (2014-09-17 15:53:23+00:00)
Title: Check if proc_open() can be used before calling it

In a environment that `proc_open()` is disabled, the `wp` command itself could not show any help text:

# wp
PHP Notice: Undefined variable: pipes in phar:///usr/local/bin/wp/php/commands/help.php on line 106
PHP Warning: proc_open() has been disabled for security reasons in phar:///usr/local/bin/wp/php/commands/help.php on line 106
PHP Warning: proc_close() expects parameter 1 to be resource, null given in phar:///usr/local/bin/wp/php/commands/help.php on line 106