There are many databases supported by php. Let’s introduce the databases supported by php.
MySQL
MySQL is the most popular relational database management system. In terms of WEB applications, MySQL is the best RDBMS (Relational Database Management System: relational database management system). ) one of the application software.
MsSql
ms SQL refers to Microsoft's SQLServer database server. It is a database platform that provides a complete solution for the database from the server to the terminal. The database The server part is a database management system used to establish, use and maintain databases.
Oracle
Oracle is a relational database management system from Oracle Corporation. It is a product that has always been in the leading position in the database field. It can be said that the Oracle database system is currently a popular relational database management system in the world. The system has good portability, easy use, and strong functions. It is suitable for various large, medium, small, and microcomputer environments. It is a database solution with high efficiency, good reliability and adaptability to high throughput.
Access
Access is a relational database management system released by Microsoft. It combines the two features of MicrosoftJet Database Engine and graphical user interface, and is one of the system programs of Microsoft Office.
PostgreSQL
PostgreSQL is a free software object-relational database management system (ORDBMS) with very complete features. It was developed by POSTGRES from the Department of Computer Science of the University of California. , an object-relational database management system based on version 4.2. Many of POSTGRES' leading concepts appeared in commercial website databases only relatively late.
InterBase
InterBase is a relational database management system (RDBMS), which provides fast data processing and processing in a stand-alone or multi-user environment. Shared tools. The core of InterBase is network operation server technology that provides transparent multi-model support. InterBase is a tool that can run on Windows 95, Windows NT, Novell NetWare and various UNIX operating systems.
CUBRID
CUBRID is a comprehensive open source and completely free relational database management system.
dBase
dBase was the first stand-alone database system widely used on personal computers.
Firebird/InterBase
Firebird Features Introduction firebird is a full-featured, powerful, efficient, lightweight, maintenance-free database.
IBM DB2
IBM DB2 is a relational database management system developed by IBM in the United States
Informix
Informix is a family of relational database management systems (RDBMS) produced by IBM.
MaxDB
MaxDB is an enterprise-level database management system.
MongoDB
MongoDB is a database based on distributed file storage.
mSQL
mSQL (mini SQL) is a single-user database management system, free for personal use and charged for commercial use. Because of its short and concise nature, the application systems developed by it are particularly favored by Internet users.
SQLite
SQLite is a lightweight database and a relational database management system that complies with ACID. It is contained in a relatively small C library.
SQLSRV
SQL Server (SQLSRV) is a relational database management system (RDBMS) developed and promoted by Microsoft.
Sybase
A relational database system developed by the American Sybase Company. It is a large database in a client/server environment on a typical UNIX or Windows NT platform. system.
tokyo_tyrant
One that can persist data has the advantage of good speed and is mostly compatible with Memcached's text protocol. The client can continue to use SpyMemcached.
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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。

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。

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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