The Process class relies on proc_open, which is not available on your PHP installation.

在centos PHP7下安装laravel 5提示如下错误

[Symfony\Component\Process\Exception\RuntimeException]
The Process class relies on proc_open, which is not available on your PHP installation.

出现以上问题的原因：由于安全性问题proc_open函数被禁用了。

解决办法：

进入php.ini文件，找到disable_function=，删除proc_open函数，即可。

在一个国外论坛上看到的一个解决方法：

链接：http://www.2by2host.com/articles/php-errors-faq/disabled_proc_open/

Function proc_open is disabled. What to do?

I see the “Warning: proc_open() has been disabled for security reasons” message on my site. What should I do? How can I fix this?

Solution for the “proc_open disabled” issue

In order to eliminate this error message you need to do ONE of the following things:

• Remove the proc_open string from the disable_functions at php.ini* file
• Ask your hosting provider to remove the string above if you don’t have an access to the php.ini* file
• Change hosting provider which allows the running of the proc_open function.