The Process class relies on proc_open, which is not available on your PHP installation.
$ sudo updatedb
$ locate php.ini
$ sudo emacs /usr/local/php/etc/php.ini
去掉禁用的函数 proc_open
; This directive allows you to disable certain functions for security reasons.
; It receives a comma-delimited list of function names.
; http://php.net/disable-functions
disable_functions = passthru,exec,system,chroot,chgrp,chown,shell_exec,popen,ini_alter,ini_restore,dl,openlog,syslog,readlink,symlink,popepassthru,stream_soc\
ket_server