Common secondary development of php include content management system development, e-commerce platform development, forum and community software development, blog software development, mailing list and newsletter software development, data processing and analysis, and network application development and API development, etc. Detailed introduction: 1. Content management system is software used to create, manage and publish website content. PHP provides many powerful CMS, such as WordPress, Drupal and Joomla, which allows developers to easily add and edit content for the website; 2. E-commerce, etc.
The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.
PHP is a popular server-side scripting language that is widely used in the field of Web development. Many developers and businesses use PHP for secondary development to meet their specific needs. The following are some common PHP secondary development scenarios:
1. Content management system (CMS) development: Content management system is software used to create, manage and publish website content. PHP provides many powerful CMS, such as WordPress, Drupal and Joomla, which allow developers to easily add and edit content for the website.
2. E-commerce platform development: PHP is also widely used in the field of e-commerce. For example, Magento and PrestaShop are two popular open source e-commerce platforms that are developed using PHP and provide developers with a powerful e-commerce solution.
3. Forum and community software development: Many online forums and communities are developed using PHP, such as vBulletin and XenForo. These software allow developers to easily create and manage online communities and provide users with a platform for interactive communication.
4. Blog software development: Many popular blogging platforms, such as WordPress and Ghost, are developed using PHP. These platforms enable developers to easily provide users with blogging functions, including article publishing, comment management, etc.
5. Mailing list and newsletter software development: PHP can also be used to develop mailing lists and newsletter software, such as Mailchimp and PHPList. These software allow developers to easily create and manage mailing lists and send customized emails and newsletters to users.
6. Data processing and analysis: PHP provides many libraries and frameworks for processing and analyzing data, such as PHP Data Objects (PDO) and Laravel framework. These tools can help developers easily connect and operate databases for data processing and analysis.
7. Web application development: PHP can be used to develop various web applications, such as chat applications, online collaboration tools, and online games. For example, Facebook was originally developed using PHP, although they have now rewritten parts of it in other languages.
8. API Development: Many businesses and organizations use PHP to develop APIs to provide access to their services. For example, RESTful APIs can be developed using PHP to enable integration with third-party applications.
In short, the secondary development scenarios of PHP are very rich. Whether it is web development, mobile app development or desktop app development, PHP can power it all. As PHP continues to be updated and developed, its applications in different fields will be further expanded.
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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