PHP object-oriented programming quick start

Object-oriented programming (OOP) is a basic programming skill. PHP4 provides good support for OOP. How to use OOP to implement advanced PHP programming is of great significance for improving PHP programming capabilities and planning the Web development architecture. The following example shows that PHP's O-Object-oriented programming (OOP) is a basic programming skill. PHP4 provides good support for OOP. How to use OOP to implement advanced PHP programming is of great significance for improving PHP programming capabilities and planning the Web development architecture. The following example illustrates the practical significance and application methods of php oop programming.
　　
When we create a website with a database background, we usually consider that the program needs to be applicable to different application environments. Different from other programming languages, in PHP, database operations are a series of specific functions (if you do not use ODBC interfaces ). Although this method is highly efficient, it is not encapsulated. If there is a unified database interface, we can apply to multiple databases without making any modifications to the program, so that the program portability and cross-platform capabilities are greatly improved.
　　
To complete OOP in PHP, object encapsulation is required, that is, writing classes. We can implement simple database encapsulation by generating a new SQL class. For example:
　　
<?
Class SQL
{
Var $ Driver; // A subclass of the actual database Driver
Var $ connection; // shared database connection variable
Function DriverRegister ($ d)
{
If ($ d! = "")
{
$ Include_path = ini_get ("include_path ");
$ DriverFile = $ include_path. "/". $ d. ". php ";
// The path where the driver is stored must be in the INCLUDE_PATH set in the PHP. ini file.
If (file_exists ($ DriverFile) // You can check whether the driver exists.
{
Include ($ DriverFile );
$ This-> Driver = new $ d ();
// Generate the corresponding database driver class based on the driver name
Return true;
}
}
Return false; // driver registration failed
}
Function Connect ($ host, $ user, $ passwd, $ database) // function used 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 () // closes the 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 a row
{
Return $ this-> Driver-> getRows ($ res );
}
Function getRowsNum ($ res) // Obtain the row number
{
Return $ this-> Driver-> getRowsNum ($ res );
}
}
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