PHP Date() 函数
PHP Date() 函数可把时间戳格式化为可读性更好的日期和时间。
语法
date(format,timestamp)
参数 | 描述 |
---|---|
format | 必需。规定时间戳的格式。 |
timestamp | 可选。规定时间戳。默认是当前的日期和时间。 |
PHP 日期 - 什么是时间戳(Timestamp)?
时间戳是自 1970 年 1 月 1 日(00:00:00 GMT)以来的秒数。它也被称为 Unix 时间戳(Unix Timestamp)。
PHP 日期 - 格式化日期
date() 函数的第一个参数规定了如何格式化日期/时间。它使用字母来表示日期和时间的格式。这里列出了一些可用的字母:
d - 月中的天 (01-31)
m - 当前月,以数字计 (01-12)
Y - 当前的年(四位数)
您可以在我们的 PHP Date 参考手册中,找到格式参数中可以使用的所有字母。
可以在字母之间插入其他字符,比如 "/"、"." 或者 "-",这样就可以增加附加格式了:
<?php echo date("Y/m/d"); echo "<br />"; echo date("Y.m.d"); echo "<br />"; echo date("Y-m-d"); ?>
以上代码的输出类似这样:
2006/07/11 2006.07.11 2006-07-11
PHP 日期 - 添加时间戳
date() 函数的第二个参数规定了一个时间戳。此参数是可选的。如果您没有提供时间戳,当前的时间将被使用。
在我们的例子中,我们将使用 mktime() 函数为明天创建一个时间戳。
mktime() 函数可为指定的日期返回 Unix 时间戳。
语法
mktime(hour,minute,second,month,day,year,is_dst)
如需获得某一天的时间戳,我们只要设置 mktime() 函数的 day 参数就可以了:
<?php $tomorrow = mktime(0,0,0,date("m"),date("d")+1,date("Y")); echo "Tomorrow is ".date("Y/m/d", $tomorrow); ?>
以上代码的输出类似这样:
明天是 2006/07/12

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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