different between 'register' and 'boot' on laravel serviceprovider

register: singleton (wihich means bind a class to current container or registering to service provider) a class to container or framework

boot or call it bootstrap which is running service provider (such as App::make('name')).

in the order running, run register at the first and then runs boot.

1. register是向容器中注册东西
2. boot用于启动相应的服务（例如事件监听等

folder permission details

There are three types of access restrictions:

Permission    Action      chmod option
======================================
read          (view)      r or 4
write         (edit)      w or 2
execute       (execute)   x or 1

There are also three types of user restrictions:

User    ls output
==================
owner   -rwx------
group   ----rwx---
other   -------rwx

Folder/Directory Permissions

Permission    Action                               chmod option
===============================================================
read          (view contents: i.e., ls command)      r or 4
write         (create or remove files from dir)      w or 2
execute       (cd into directory)                    x or 1

Numeric notation

Another method for representing Linux permissions is an octal notation as shown by stat -c %a. This notation consists of at least three digits. Each of the three rightmost digits represents a different component of the permissions: owner, group, and others.

Each of these digits is the sum of its component bits in the binary numeral system:

Symbolic Notation    Octal Notation    English
============================================================
----------            0000               no permissions
---x--x--x            0111               execute
--w--w--w-            0222               write
--wx-wx-wx            0333               write & execute
-r--r--r--            0444               read
-r-xr-xr-x            0555               read & execute
-rw-rw-rw-            0666               read & write
-rwxrwxrwx            0777               read. write & execute

Now, what does 755 mean?

7=rwx 5=r-x 5=r-x

This means that the directory has the default permissions -rwxr-xr-x (represented in octal notation as 0755).