Self-learning PHP can save the training cost, and can freely arrange the learning progress and content, which is more suitable for people with certain self-learning ability and self-management ability. But self-study also needs to pay more time and energy, find study materials and practice items by yourself, and solve problems by yourself.
Participating in PHP training institutions can gain a more systematic and comprehensive PHP knowledge system, and can also exchange learning experiences with other students. In addition, training institutions will also provide some employment guidance and recommendations to help you find PHP-related jobs faster. However, training institutions need to pay high tuition fees, and may face training institutions with uneven quality and unsatisfactory curriculum arrangements.
Generally speaking, self-learning PHP and participating in training institutions have their own advantages and disadvantages, and the choice of which method requires comprehensive consideration of personal situation, learning objectives and resources.
PHP is a scripting language widely used in Web development. Its main features are simple, easy to learn and use, good cross-platform performance and strong integration ability with MySQL and other databases. The PHP knowledge system includes the following aspects:
1. Basic syntax: variables, data types, operators, process control, functions, arrays, etc.
2. Object-oriented programming: class, object, inheritance, polymorphism, interface, etc.
3.Web development related technologies: HTTP protocol, request and response, session management, Cookie, session, form processing, etc.
4. Database operation: connection, query, update and transaction processing of relational databases such as MySQL.
5. Common frameworks: How to use common PHP frameworks such as Laravel, Yii and ThinkPHP?
6. Common extensions: How to use common PHP extensions such as GD, XML, PDO, etc.
From the bottom principle, PHP is an explanatory language, and its execution process includes lexical analysis, syntax analysis, intermediate code generation, intermediate code execution and other stages. The interpreter of PHP is usually integrated with Web servers (such as Apache and Nginx) in the form of CGI or FastCGI, and usually uses PHP data object (PDO) or MySQLi to interact with the database. In addition, PHP also supports Zend engine to compile and interpret PHP code.