【在线求助】关于php定时器问题
新手求助关于php定时器问题:
我想在php上写个定时器,但php貌似不支持这个功能, 在网上查了很多朋友的方法,但都不行,
我现在想通过一个死循环来实现,但也不行,求助给我大哥大姐了。。。
<?php<br /> ignore_user_abort(true);<br /> set_time_limit(0); <br /> function test(){<br /> echo "测试定时器!";<br /> }<br /> <br /> do{<br /> sleep(3);//<br /> test();<br /> }while(1) <br /> ?>
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你想要干什么?
------解决方案--------------------
jquery延时吧,结合 ajax。
------解决方案--------------------
crontab/计划任务
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其实你的方法是可行的 值是不应该用echo来表现 因为PHP在运行过程中echo的信息是存放在缓冲区的 在程序运行完前并不会输出 所以你看不到效果
你可以把echo换成数据库操作语句 比如没5秒添加1条数据 你再看一下有没有用
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还有 测试时最好不要加ignore_user_abort 这个会后台运行 即使关闭浏览器仍然会继续执行 除非从进程中停止
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网页关闭有效时间就不会更新了呀
比如你定时是1分钟访问一次 那么有效时间和当前时间的时间差超过1分钟的用户自然就不在线
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可以用window.setInterval();结合ajax来不断的向某个php文件发送数据,或者请求数据。
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可以用递归函数实现你的这个功能

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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