Summary of some points to note in PHP development_PHP tutorial

Use of Linux system

The standard system now is Linux + Nginx + PHP + MySQL. This configuration is used by more and more large companies. Speaking of different configurations, According to a company's regulations, for example, mounting is generally divided into 2 disks, and / is divided into 10G partitions for system use. The remaining space is enough to be allocated to /home. I feel better about this. It turns out that I have too many partitions. Next, the second is the safe login of the system. Nowadays, the approach of small companies or individuals is to log in directly using the account or password through the network. However, the approach of large companies is to log in to the relay server first, and then log in to the target server through the relay server. In this way, the account will be recorded and the security is relatively high. Nowadays, TOKEN and RSASecurID are generally used for password login, which improves the overall security.



PHP calls shell command

In the past, I didn’t use php to call the shell to perform some additional tasks. Now I will use it frequently, so that I can do things other than scripts. This feels more convenient

Coding habits are often used differently by each company and team. In particular, different programming IDEs lead to different coding standards and different conventions. However, for the overall habits, the team The decision of all the staff has been made. This was not very strict in the original small company, and it is still the same now. It seems that this has a lot to do with the team culture. The people in the team have been together for a long time. , you are naturally familiar with it.


Function return value

Generally, false is returned for failure to obtain the return value, and for various situations that occur , returns the value of int. If it is data, it returns array or other. Due to the use of memcache, the current function uses a lot of cache operations within the function. The return value is also obtained from the cache first. If it is not in the database Get it from, then write it into cache, and then return the data

For processing data, the original writing method is to write the data in $_POST && $_GET, and then perform addslashes processing. The current method is to receive it directly and then perform Determine whether the data meets the requirements, then splice the sql, then perform mysql_escape_string processing on the sql statement, and then use htmlspecialchars for processing when reading the data, so that there will be no problem with the display.



PHP implementation of locking mechanism

I wrote an article some time ago about common locking and specific PHP implementation of locking



About the issue of queue distribution

MQ is used to distribute Memcache data. I haven’t figured this out yet. I have to ask for advice on the specific implementation



Understanding about the error level of PHP

For error level, we used to use the relatively light E_ALL | E_STRICT during development. Now it is replaced by E_ALL & ~E_STRICT Develop a good habit of defining variables. Initialization is necessary when using them.


Control to prevent users from posting illegal information and advertisements and control the frequency of user behavior

For advertisements and illegal information posted by users, the SPAM system is used to control them to prevent problems. User behavior is restricted to prevent users from controlling resources too much. Self-increasing unique IDs cannot be used for variables in the system. , encryption processing is required, and the returned system information can be obtained by others. Including encryption processing of user ID and data information ID.