Usage of PHP EOF (heredoc), eofheredoc
<?php /* Heredoc技术,在PHP手册和技术书籍中一般没有详细讲述,只是提到了这是一种Perl风格的字符串输出技术。 目前一些论坛程序和CMS系统使用了这种技术,前不久看一个朋友的PHPWIND论坛时碰到过使用这种技术的。 如果你需要在PHP中写大块的HTML拼装操作,这不失为是一种很好的选择,因为你不需要担心引号带的问题, 也省去了字符串连接的繁琐。 */ //如下例子: $var = 'PHP变量'; echo <<<EOF <div> PHP heredoc技术 <br /> $var </div> EOF; echo <<<zhangshan <hr /> <div> PHP heredoc技术 <br /> $var </div> zhangshan; /* 注意: 1.herdoc 以“<<<End”开始标记开始,以“End;”结束标记结束,结束标记必须单独占一行、 前面不能有任何字符串包括空格,结尾要有分号结束。 2.结束开始标记必须相同,比如常用大写的EOT、EOD、EOF来表示,不是必须使用这3个标记, 和PHP的变量名规则基本相同,一般使用约定都是大写。 3.开始和结束标记之间的PHP变量会被解析,函数不会执行、不能进行运算操作。 变量之间的连接不需要字符串连接符。 4.标记字符串不能在开始结束标记之间出现一样的字符串,区分大小写。 */ //例如下面: $a = 12; $b = 12; $arr = array('hello'=>'world'); echo <<<EOF <div> PHP heredoc技术 <br /> $a$b <br /> $a+$b <br /> {$arr['hello']} </div> EOF;

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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