Basic knowledge of PHP Object-Oriented Programming

What we will introduce to you today is aboutNext we will illustrate the practical significance and application methods of using PHP object-oriented programming through examples.

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.

The completion of PHP object-oriented programming requires object encapsulation, 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 );
  
  
}
  
  
}
  
  
?>
 
 

I hope that the above PHP object-oriented programming knowledge will help you.