PHP, "Hypertext Preprocessor", is a general open source scripting language. PHP is a scripting language executed on the server side. It is similar to C language and is a commonly used website programming language. PHP's unique syntax mixes C, Java, Perl, and PHP's own syntax. It is conducive to learning and widely used. It is mainly suitable for the field of web development.
Compared with other programming languages, PHP embeds programs into HTML (an application under Standard Universal Markup Language) documents. Execution, execution efficiency is much higher than CGI that completely generates HTML tags; PHP can also execute compiled code, and compilation can achieve encryption and optimization of code running, making the code run faster.
According to the requirements of dynamic websites, PHP language, as a language program, its specificity gradually appears in the application process, and its technical level will directly affect the operating efficiency of the website. Its characteristics are that it has an open source code and is highly similar to general-purpose languages such as C language in terms of programming. Therefore, it is easy to understand and has strong operability during operation.
At the same time, the PHP language has a high level of data transmission processing and output, and can be widely used in Windows systems and various web servers. If the amount of data is large, the PHP language can also broaden the link surface and connect to various databases to alleviate the pressure of data storage, retrieval and maintenance.
With the development of technology, PHP language search engines can also tailor their services to implement personalized services, such as classifying, collecting and storing data according to customer preferences, which greatly improves the efficiency of data operation.
Development tools:
The integrated development environment is an integrated development environment that integrates the main tools required in the software development process. Its functions include but are not limited to code high-level Lighting, code completion, debugging, building, version control, etc. Some common PHP IDEs are as follows:
1. Zend Studio: Commercial version, officially produced by Zend, based on eclipse
2. Eclipse with PDT: Free
3. Coda: Commercial version, for Mac users
4. NetBeans: Free, powerful
5. PHP Storm: Commercial version
6. Aptana Studio: Free
7. PhpEd: Commercial Edition
8. Komodo IDE/Edit: IDE is a commercial version, Edit is free to use
9. Adobe Dreamweaver: Commercial Edition
Remove integration Development environment, common text editors with code highlighting functions are often chosen as development tools because of their lightness and flexibility, such as: Notepad, Editplus, SublimeText, Everedit, etc.
The above is the detailed content of What is php?. 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。

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。

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。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

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。


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