看网页的一个正则的例子,出错了。帮看一下那错了呗。最好帮解释一下各个符号的意思,正在学
看网页的一个正则的例子,出错了。帮看一下那错了呗。最好帮解释一下各个符号的意思,正在学
//取出 div 标签,且ID 为 PostContent 的内容,并存到阵列 match 中。
preg_match('/
这个正则是不是 perl 风格的。不是 POSIX风格 的。学的二个有点乱。
好想弄明白这个。
出错信息:
Warning: preg_match() [function.preg-match]: Unknown modifier '/' in D:\xampp\htdocs\testweb02\t1.php on line 6
------解决方案--------------------
preg_match('/
改成
preg_match('/
或者
preg_match('/
------解决方案--------------------
我也是刚刚学的正则表达式,高深的也不懂,说一个方法,不知道是不是你想要的。
要是想取到那个里面的内容,可以用eregi("
- (.*)
其中的$content=file_get_contents($url);$url是你要截取的内容网站的url,而$eg储存了你要保存的内容。
然后echo $eg[1];就可以取出里面的内容了,至于$eg是一个数组,里面具体都是什么,我也不是很清楚,你可以看一下eregi函数的相关知识。

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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