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This article will explain in detail the sample analysis of getting started with PHP programming. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Object-oriented programming (OOP) is one of our basic programming skills, and PHP4 provides good support for OOP. How to use the idea of OOP to carry on the advanced programming of PHP is very meaningful for improving the programming ability of PHP and planning the Web development framework. Below we will illustrate the practical significance and application method of programming with OOP of PHP through an example.

When we do a website with a database background, we usually consider that the program needs to be suitable for different application environments. Unlike other programming languages, in PHP, the database is operated by a series of specific functions (if you don't use the ODBC interface). Although this is very efficient, the encapsulation is not enough. If there is a unified database interface, then we can apply to a variety of databases without any changes to the program, so that the portability and cross-platform ability of the program are greatly improved.

To complete OOP in PHP, you need to do object encapsulation, that is, to write classes. We can simply encapsulate the database by generating a new SQL class.

For example:

< ? class SQL { var $Driver; //实际操作的数据库驱动子类 var $connection; //共用的数据库连接变量 function DriverRegister($d) { if($d!="") { $include_path = ini_get("include_path"); $DriverFile = $include_path."/".$d.".php"; //驱动的存放路径必须在PHP.ini文件中设定的INCLUDE_PATH下 if( file_exists( $DriverFile)) //查找驱动是否存在 { include($DriverFile); $this->

Driver = new $d (); / / generate the corresponding database driver class return true;}} return false; / / failed to register driver} function Connect ($host,$user,$passwd,$database) / / function to connect to the database {$this- > Driver- > host=$host; $this- > Driver- > user=$user; $this- > Driver- > passwd=$pas swd; $this- > Driver- > database=$d atabase; $this- > connection = $this- > Driver- > Connect () } function Close () / close database function {$this- > Driver- > close ($this- > connection);} function Query ($queryStr) / / database string query function {return $this- > Driver- > query ($queryStr,$this- > connection);} function getRows ($res) / / find lines {return $this- > Driver- > getRows ($res);} function getRowsNum ($res) / / get line number {return $this- > Driver- > getRowsNum ($res) }? >

Let's take the operation of MySQL database as an example. We write a database driver class MySQL, in which we further encapsulate the functions related to MySQL database operations. Put the file that contains this class, named MySQL.php, under PHP's system include_path, and you can use it normally. Note that when writing a database driver file, the file name should be the same as the class name.

< ? Class MySQL { var $host; var $user; var $passwd; var $database; function MySQL() //利用构造函数实现变量初始化 { $host = ""; $user = ""; $passwd = ""; $database = ""; } function Connect() { $conn = MySQL_connect($this->

Host, $this- > user,$this- > passwd) or die ("Could not connect to $this- > host"); MySQL_select_db ($this- > database,$conn) or die ("Could not switch to database $this- > database;"); return $conn;} function Close ($conn) {MySQL_close ($conn); function Query ($queryStr, $conn) {$res = MySQL_query ($queryStr, $conn) or die ("Could not query database"); return $res;} function getRows ($res) {$rowno = 0 $rowno = MySQL_num_rows ($res); if ($rowno > 0) {for ($row=0;$row)

Similarly, if we want to encapsulate other "database drivers" into our SQL class, we just need to create the corresponding class, name the driver file with the same name, and put it in the include directory of PHP.

After the encapsulation is completed, you can program the database according to the idea of OOP in PHP.

DriverRegister ("MySQL")) / / Register database driver {$sql- > Connect ("localhost", "root", "", "test"); $res=$sql- > query ("select * from test"); / / return query recordset $rowsnum = $sql- > getRowsNum ($res); if ($rowsnum > 0) {$rows = $sql- > getRows ($res); foreach ($rows as $row) / / Recordset content {foreach ($row as $field) {print $field } $sql- > Close ();}? >

In practical application, we can further expand all kinds of object classes according to the actual needs. In PHP, a series of complex OOP methods are also provided, such as inheritance, overloading, references, serialization, and so on. By fully mobilizing various methods and using them flexibly, you can make your website more reasonable and structured, and easier to develop and maintain.

This is the end of this article on "sample Analysis of getting started with PHP programming". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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