php基础教程笔记
很久就知道php,但是一直没时间去学习,现在开始要好好学习php,希望有一天从c#的繁琐解脱出来,走向php的简洁明了。就一项开发环境的庞大就够我麻烦,每次装机都要装一遍vs,sql。
php的环境搭建很简单,因为我走了一个捷径,网上下载了wamp service 2.5,官方网址http://www.wampserver.com/,有32位和64位的,必须下载跟系统一致的版本,不然会出现奇怪的错误,这个耽误了我很长时间。
学习语言当然需要书籍,在网上找到一个电子版的php基础教程4,非常适合php新手学习,以下是我的学习笔记,记录下来供以后参看,也是对自己的督促。
一、实现输出hello world的几种方法
<?php echo "hello world!";
print "hello world!";
print_r("hello world!");
eval("echo \"hello world\";")<br>?>
echo可以一次输出多个值。echo是语言结构(language construct),而并不是真正的函数。
print()只适用于标量类型如数字和字符串,如果字符串成功显示则返回true,否则返回false。
print_r()可以把字符串和数字简单地打印出来,而数组则以括起来的键和值得列表形式显示,并以Array开头。
eval()函数会执行字符串中的php代码。
- 1楼yangtoude
- 你好,我也正在学习php。交个朋友吧~
- Re: 天晴就快乐
- @yangtoude,我刚接触呢,相互学习吧

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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