The new features of PHP8, the constructor attribute, are greatly enhanced!

The steps to add mysql extension to php8 are: 1. Install the MySQL client library; 2. Install the development tools for PHP 8; 3. Download the MySQL extension source code; 4. Compile and install the MySQL extension; 5. Enable the MySQL extension; 6. Restart Just a web server.

The differences between php5 and php8 are in terms of performance, language structure, type system, error handling, asynchronous programming, standard library functions and security. Detailed introduction: 1. Performance improvement. Compared with PHP5, PHP8 has a huge improvement in performance. PHP8 introduces a JIT compiler, which can compile and optimize some high-frequency execution codes, thereby improving the running speed; 2. Improved language structure, PHP8 introduces some new language structures and functions. PHP8 supports named parameters, allowing developers to pass parameter names instead of parameter order, etc.

This article will introduce to you how to install apache2.4 and how to configure php8.0. The article is accompanied by pictures and detailed steps. Let's take a look at how to install and configure apache2.4+php8.0~

PHP8 can use mysqli and PDO to connect to the database. Detailed introduction: 1. Use mysqli to connect to the database by passing in the database server name, user name, password and database name to connect. Then, use the `connect_error` attribute to check whether the connection is successful and output an error message if the connection fails. Finally, close the connection by calling the `close()` method; 2. Use PDO to connect to the database, and connect by passing in the database server name, password and database name, etc.

The methods of the php8 data type include converting strings to integers, converting integers to strings, converting strings to floating point numbers, converting floating point numbers to strings, converting arrays to strings, converting strings to arrays, and converting Boolean values ​​to integers. Integer conversion to Boolean value and variable type determination and conversion. Detailed introduction: 1. Converting a string to an integer includes the intval() function and (int) forced type conversion; 2. Converting an integer to a string includes the strval() function and (string) forced type conversion; 3. Converting a string to a float Points and so on.

This article will take you through the JIT in PHP 8 and talk about how JIT participates in the interpretation process. I hope it will be helpful to everyone!

The improved performance of php8 includes: 1. Introduction of JIT compiler; 2. Optimization of function calls; 3. Improvement of garbage collection mechanism; 4. Improvement of type system; 5. New language features; 6. Optimized string processing; 7. Improve array processing; 8. Introduce a new memory management mechanism; 9. Optimize code generation. Detailed introduction: 1. The introduction of the JIT compiler. PHP8 introduces the JIT compiler, which is a dynamic compilation technology that can convert PHP code into machine code for more efficient execution; 2. Optimization of function calls, etc.

Features of php8: 1. JIT compiler; 2. Named parameters; 3. Union types; 4. Annotations; 5. Constructor attribute enhancement; 6. Match expression; 7. nullsafe operator; 8. Improved type system; 9 , Error handling improvements; 10. Consistency improvements. Detailed introduction: 1. JIT compiler, PHP8 introduces just-in-time compilation technology, which compiles PHP code into native machine code, thereby improving the execution speed of the program; 2. Named parameters, PHP8 supports named parameters, allowing the use of parameter names when calling functions. etc.