What is the difference between php5 and php7

PHP 7 is a major update to PHP 5, bringing significant improvements in speed, performance and functionality: Speed ​​and Performance: JIT compiler and optimized Opcache increase execution speed and reduce compilation overhead. New features: Type declarations improve code reliability; anonymous classes allow the creation of temporary classes; generators generate values ​​on demand. Other improvements: Exception handling improvements simplify exception catching; namespaces support organizing large code bases; new syntax features enhance code readability.

The difference between PHP 5 and PHP 7

PHP 7 is a major update of PHP 5, released in 2015 , bringing significant improvements in speed, performance, and functionality.

Speed ​​and performance

• JIT (just in time compilation): PHP 7 introduces a JIT compiler that can compile PHP code into machine code, thereby significantly increasing execution speed.
• Opcache: PHP 7 optimized Opcache caches compiled PHP code, reducing compilation overhead for subsequent requests.

New features

• Type declarations: PHP 7 introduced type declarations, allowing developers to specify variables and function returns Types of values ​​to improve code reliability and maintainability.
• Anonymous classes: Anonymous classes allow developers to create temporary classes that do not have a name and inherit from another class.
• Generator: Generator is a special PHP function that allows generating values ​​on demand without consuming large amounts of memory.

Other improvements

• Exception handling improvements: PHP 7 introduced improvements to exception catching, including finally and throws keywords.
• Namespace support: PHP 7 provides support for namespaces, allowing developers to organize and manage large code bases.
• Better syntax support: PHP 7 introduces new syntax features such as the null coalescing operator (??) and the spaceship operator (<=>).

Conclusion

PHP 7 is a major improvement over PHP 5, bringing significant advantages in speed, performance and functionality. By taking advantage of the JIT compiler, Opcache, and other optimizations, PHP 7 can significantly improve application performance. Additionally, it introduces new features and syntax improvements that enhance code readability, maintainability, and reusability.

The above is the detailed content of What is the difference between php5 and php7. For more information, please follow other related articles on the PHP Chinese website!