What are the differences between php5 and 7?

PHP is a widely used open source server-side scripting language originally designed for web development and has now become a general-purpose language. Versions of PHP have gone through many updates and upgrades, one of the most talked about is the difference between PHP5 and PHP7. When PHP5 was released in 2004, it introduced many new features and improvements, but the release of PHP7 brought huge improvements in performance and security. What are the differences between PHP 5 and 7? This article discusses these differences in detail.

1. Faster performance

PHP7 is much faster than PHP5. According to official benchmarks, PHP7's execution speed is more than twice that of PHP5. This is an important advantage for websites and apps, as speed is a key factor in user experience and search rankings.

PHP7 has implemented the following technical upgrades:

• JIT-based engine (Just In Time). It provides the ability to precompile scripts, speeding up execution.
• Zend Engine 3.0. It is the core of PHP7 and is highly optimized for performance.
• Optimize the syntax format. PHP7 adopts a more concise syntax format and does not require the use of eval() or preg_replace(), thus improving performance.

2. Higher performance and processing power

PHP7 is not only faster, it also handles requests better. It can handle more requests on the same server, reducing server response time and resource overhead.

3. Better compatibility

PHP7 is also more outstanding in terms of compatibility. It is able to handle more applications and libraries without conflicts or errors. At the same time, PHP7 supports more Unicode character sets and other international standards, and can support more languages ​​and international applications.

4. Strict error and exception handling

PHP7 introduces a new error and exception handling mechanism. These mechanisms can quickly detect errors and exceptions in PHP applications and point them to the location of the error. This way, developers can diagnose and fix errors faster, making applications more stable and robust.

5. Better password security

PHP7 brings stronger password security. It provides new built-in encryption tools, such as Argon2, and also supports a wider range of password hashing algorithms, such as SHA-3 and bcrypt. These encryption tools protect application and user passwords, reducing the risk of hacking.

6. Improved error handling

PHP7 brings improved error handling. Now, when an error occurs in your application, PHP will display a detailed error report including the error type, error location, and error reason. Therefore, developers can quickly locate bugs and fix them.

7. Type declaration

PHP7 supports type declaration. When using a function or method, developers can specify the data types of parameters and the data type of return values, which helps avoid unexpected type conversion errors.

8. Extension upgrade

PHP7 supports many extensions, including improved MySQLi (for MySQL database connections) and new PostgreSQL extensions. These upgrades improve performance and scalability, making it easier for developers to connect PHP applications to databases.

Summary

The difference between PHP7 and PHP5 is huge. Huge improvements in performance and security are a major advantage of PHP7. Thanks to these improvements, PHP7 can bring faster speeds and better responsiveness to websites and applications, and protect application and user data security. When developing or updating applications using PHP7, pay attention to its new syntax and type declarations in order to write your code correctly and take better advantage of PHP7's features. Choosing between PHP5 and 7 may depend on the developer's needs and budget, but considering its performance and security advantages, PHP7 is the better choice.

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