The current number of APIs is 49. Commonly used calculations (11) min - find the minimum value max — find the maximum value abs — absolute value round — Round floating point numbers ceil — Returns the smallest integer greater than or equal to the specified expression, ceiling function floor —Returns the largest integer less than or equal to the specified expression, the floor function intdiv — Rounds the result of division and returns the quotient fmod — Returns the floating-point remainder of division, returns the remainder is_nan — Determine whether it is a legal value hypot — Calculate the length of the hypotenuse of a right triangle sqrt — square root angle, radians (3) pi — get pi value deg2rad — Convert angles to radians rad2deg — Convert radians to corresponding degrees. Base conversion (7) base_convert — Convert numbers between any bases. decbin — Convert decimal to binary bindec — convert binary to decimal decoct — Decimal conversion to
1. Recommended 4 articles about is_nan
Introduction: The current number of APIs is 49. Commonly used calculations (11) min - find the minimum value max - find the maximum value abs - absolute value round - round floating point numbers ceil - return greater than or equal to the specified expression Minimum integer, ceiling function floor — returns the largest integer less than or equal to the specified expression, floor function intdiv — rounds the division result, returns the quotient fmod — returns the floating point remainder of the division, returns the remainder is_nan — ...
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##Introduction: The current number of APIs is 49. Commonly used calculations (11) min - Find the minimum value max - Find the maximum value abs - Absolute value round - Round floating point numbers ceil - Return the smallest integer greater than or equal to the specified expression, ceiling Function floor — Returns the largest integer less than or equal to the specified expression, floor function intdiv — Rounds the division result, returns the quotient fmod — Returns the floating point remainder of the division, returns the remainder is_nan — ...
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##Introduction: The current number of APIs is 49 Common calculations (11) min — find the minimum value max — find the maximum value abs — absolute value round — round floating point numbers ceil — return the smallest integer greater than or equal to the specified expression, ceiling function floor — return less than or equal to the specified expression The maximum integer of the expression, the floor function intdiv — rounds the division result and returns the quotient fmod — returns the floating point remainder of the division, returns the remainder is_nan — determines whether it is a legal value h...
5.
Detailed introduction to custom 404 in python## Introduction: This article The article mainly introduces the detailed method of Django to implement customized 404, 500 pages. It is very simple and practical. Friends in need can refer to the following 1. Create a project django-admin.py startproject HelloWorld 2. Enter the HelloWorld project, in manage.py In the same level directory, create the templates directory and create two new files, 404.html and 500.html, in the templates directory. 3. Modify settings....
6. Detailed introduction to the main interface
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PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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