Local variables can be divided into dynamic storage types and static storage types in terms of storage methods. Local variables in a function, unless specifically declared as static storage class, will allocate storage space dynamically by default. The internal dynamic variables are automatically released after the function call. If you want the internal variables to remain in memory after the function is executed, you should use static variables. After the function is executed, the static variables will not disappear, but will be shared among all calls to the function. That is, when the function is executed again, the static variables will continue to operate from the previous results, and will only be used during the execution of the script. The period function is initialized the first time it is called. To declare a function variable as static, you need to use the keyword static. Earlier we introduced the local variables in the scope of PHP variables and the global variables in the scope of PHP variables. Static variables can be applied anywhere. Once the application is successful, it will no longer accept other similar applications. A static variable does not mean that it cannot change its value. A quantity that cannot change its value is called a constant. The value it holds is mutable, and it will remain up-to-date. It is said to be static because it does not change when the function is called or exits. That is, the last call
Introduction: Local variables can be divided into dynamic storage types and static storage types in terms of storage methods. Local variables in a function, unless specifically declared as static storage class, will allocate storage space dynamically by default.
2. PHP source code learning thread safety
Introduction: In terms of scope, C language can be defined 4 different kinds of variables: global variables, static global variables, local variables, static local variables.
3. static local variables of php
Introduction::This article mainly introduces the static local variables of php Variables, students who are interested in PHP tutorials can refer to it.
4. Summary of PHP static local static variables and global static variables_PHP tutorial
Introduction: PHP static local Summary of static variables and global static variables. Characteristics of static local variables: 1. It will not change as the function is called and exits. However, although the variable continues to exist, it cannot be used. If the function that defines it is called again
##5. Look at the characteristics of C, C++, C#, Java, and PHP through static local variables
Introduction: Look at the characteristics of C, C++, C#, Java, and PHP through static local variables
6. Summary of PHP static local static variables and global static variables
Introduction: Summary of PHP static local static variables and global static variables. Characteristics of static local variables: 1. It will not change as the function is called and exits. However, although the variable continues to exist, it cannot be used. If the function that defines it is called again
7. Summary of PHP static local variables and static global variables
Introduction : 1. It will not change as the function is called and exits. However, although the variable continues to exist, it cannot be used. If the function that defines it is called again, it can continue to be used, and the value left after the previous call is saved. 2. Static local variables will only be initialized once. 3. Static properties can only be initialized to a character value or a Constants cannot be used
8. PHP static Summary of local static variables and global static variables_PHP
Introduction: The reason for using a static local variable is that it cannot be used externally, but its value is retained after no such use. Although the same functionality can be achieved using global variables, it often results in unexpected
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What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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