Advantages and disadvantages of php

PHP (foreign name: PHP: Hypertext Preprocessor, Chinese name: "Hypertext Preprocessor") is a general open source scripting language. The grammar absorbs the characteristics of C language, Java and Perl, which is convenient for learning and widely used. It is mainly suitable for the field of Web development. PHP's unique syntax mixes C, Java, Perl, and PHP's own syntax. It can execute dynamic web pages faster than CGI or Perl. Compared with other programming languages, dynamic pages made with PHP embed the program into the HTML (an application under the standard universal markup language) document for execution, and the execution efficiency is higher than that of completely generating HTML tags. CGI is much higher; PHP can also execute compiled code. Compilation can achieve encryption and optimize code running, making the code run faster.

The following introduces the advantages and disadvantages of PHP

1. Advantages

1. Cross-platform, superior performance, combined with Linux/Unix, not Windows The performance is 45% better, and it is very economical to combine with many free platforms, such as LAMP (Linux /Apache/Mysql/PHP) or FAMP (FreeBSD/Apache/Mysql/PHP). If the data application is large enough, you can consider changing to PostgreSQL or Oracle supports N types of databases. (N >= 10)

2. The syntax is simple, if you have learned C and Perl, it is easy to get started, and it is partially similar to ASP. There are mature development tools, such as NuPHPed, or Zend Studio, etc., and you can use Eclipse and so on under the Linux platform.

3. Currently, mainstream technologies are supported, such as WebService, Ajax, XML, etc., which are sufficient for application.

4. There is relatively complete support, such as using ADODB or PEAR::DB as the database abstraction layer, using Smarty or smart template as the template layer. If it is PHP 5.1, you can also use PDO (PHP Data Object ) to access the database.

5. There are many mature frameworks, such as the framework that supports MVC: phpMVC, which supports event-driven frameworks like ASP.net: Prado, which supports rapid development like Ruby On Rails Framework: Cake, etc., enough to meet your application needs.

6. PHP 5 already has a mature Object-oriented system that can adapt to basic object-oriented requirements. Suitable for developing large-scale projects.

7. There is a mature community to support PHP development.

8. Currently, many large-scale applications use PHP, such as Taobao, Yahoo, 163, Sina and other large portals. Many of them choose PHP as their development language, so large portals can choose it. I think it's enough for your use.

9. There are many open source frameworks or open source systems that can be used. For example, the well-known open source frameworks include Zend Framework, CakePHP, CodeIgniter, symfony, etc., the open source forums include Discuz!, Phpwind, etc., and the open source blog WordPress, Open source online store systems such as Ecshop, ShopEx, etc., and open source SNS systems such as UCHome, ThinkSNS, etc.

10. Low cost of use (linux apache mysql php kernel)

2. Disadvantages

1. The support for multi-threading is not very good, and the Most of the time we can only implement it through simple simulation.

2. The syntax is not very strict. For example, variables can be used without being defined. In c, java, and c++, variables must be defined before they can be used.

3.PHP’s interpretation and operation mechanism. This operating mechanism ensures that after each PHP page is interpreted and executed, all related resources will be recycled. In other words, PHP has no way to make an object resident in memory at the language level. In PHP, all variables are page-level. Whether they are global variables or static members of the class, they will be cleared after the page is executed. Take JSP as an example. In JSP, the scope of Java Bean has four valid values: Page, Application, Session, and Request, which respectively correspond to the four lifetimes of page, program, session, and request. But in PHP, there is only one lifetime of Page.

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