PHP 日期函数说明
在页面的最前页加上date_default_timezone_set(PRC); /*把时间调到北京时间,php5默认为格林威治标准时间*/date ()date():a: "am"或是"pm" A: "AM"或是"PM" d: 几日，两位数字，若不足则补零；从"01"至"31" D: 星期几，3个英文字母，如:"Fri" F: 月份，英文全名，如:"January" h: 12小时制的小时，从"01"至"12" H: 24小时制的小时，从"00"至"23" g: 12小时制的小时，不补零；从"1"至"12" G: 24小时制的小时，不补零；从"0"至"23" j: 几日，不足不被零；从"1"至"31" l: 星期几，英文全名，如："Friday" m: 月份，两位数字，从"01"至"12" n: 月份，两位数字，不补零；从"1"至"12" M: 月份，3个英文字母；如："Jan" s: 秒；从"00"至"59" S: 字尾加英文序数，两个英文字母,如："21th" t: 指定月份的天数，从"28"至"31" U: 总秒数 w: 数字型的星期几，从"0(星期天)"至"6(星期六)" Y: 年，四位数字 y: 年，两位数字 z： 一年中的第几天；从"1"至"366"mktime()://函数返回一个日期的 Unix 时间戳。//参数总是表示 GMT 日期，因此 is_dst 对结果没有影响。mktime(hour,minute,second,month,day,year,is_dst)hour： 可选。规定小时。 minute： 可选。规定分钟。 second： 可选。规定秒。 month： 可选。规定用数字表示的月。 day： 可选。规定天。 year： 可选。规定年。在某些系统上，合法值介于 1901 - 2038 之间。不过在 PHP 5 中已经不存在这个限制了。 is_dst： 可选。如果时间在日光节约时间(DST)期间，则设置为1，否则设置为0，若未知，则设置为-1。 自 5.1.0 起，is_dst 参数被废弃。因此应该使用新的时区处理特性。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1673
14
1429
52
1333
25
1278
29
1257
24
Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?
Apr 17, 2025 am 12:06 AM
In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?
Apr 17, 2025 am 12:25 AM
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.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
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.
How do you prevent SQL Injection in PHP? (Prepared statements, PDO)
Apr 15, 2025 am 12:15 AM
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: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
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: Handling Databases and Server-Side Logic
Apr 15, 2025 am 12:15 AM
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.
PHP's Purpose: Building Dynamic Websites
Apr 15, 2025 am 12:18 AM
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.
Choosing Between PHP and Python: A Guide
Apr 18, 2025 am 12:24 AM
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.
