PHP is a programming language implemented in C and is usually used for Web development, but it does not mean that PHP can only be used for Web development. It is absolutely possible to write crawlers in PHP and do automated operation and maintenance; you can do more with C extensions, such as Swoole high-performance network programming and OHSCE industrial control programming.
Naturally, there are many application scenarios (computing intensive) that PHP is not suitable for, such as operating system development and database engine development.
But PHP can do auxiliary development for these systems, such as using PHP to develop a phpMyAdmin to visually manage the database MySQL, such as developing a "phpLinuxAdmin" to manage a Linux server without a graphical interface.
In short, we must maximize its strengths and avoid weaknesses, and adapt to local conditions in order to fully and reasonably utilize the advantages of PHP.
PHP scripts are mainly used in the following three areas:
Server-side scripts. This is the most traditional and main target area of PHP.
To carry out this work, you need the following three points: PHP parser (CGI or server module), web server and web browser. You need to install and configure PHP when running the web server. Then, you can use a web browser to access the output of the PHP program, that is, browse the PHP page on the server. If you're just experimenting with PHP programming, all of this can be run on your home computer. Please consult the Installation chapter for more information.
Command line script. You can write a PHP script and don't need any server or browser to run it.
In this way, only the PHP parser is needed to execute. This usage is ideal for daily running scripts that rely on cron (Unix or Linux environments) or Task Scheduler (Windows environments). These scripts can also be used to process simple text. See PHP's command line mode for more information.
Write desktop applications.
For desktop applications with graphical interfaces, PHP may not be the best language, but if the user is very proficient in PHP and wants to use some advanced aspects of PHP in client applications Features, you can use PHP-GTK to write these programs. In this way, you can also write cross-platform applications. PHP-GTK is an extension of PHP that is not included in the commonly distributed PHP packages.
PHP can be used on all major operating systems, including Linux, various variants of Unix (including HP-UX, Solaris, and OpenBSD), Microsoft Windows, Mac OS X, RISC OS, etc.
The above is the detailed content of What else can PHP do besides web development?. For more information, please follow other related articles on the PHP Chinese website!

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。

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。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

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。

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。

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。


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