PHP Exception Handling

1. PhP5 provides the basic exception handling class, which can be directly used.

<? PHP
 Class   Exception 
{
 Protected   $ Message = 'Unknown exception '; //  Exception Information  
      Protected   $ Code = 0; //  User-defined exceptionCode  
     Protected   $ File ; //  File Name with exception  
      Protected   $ Line ; //  Abnormal code line number  
 
 Function _ Construct ( $ Message = Null , $ Code = 0 );

 Final   Function Getmessage (); //  Return exception information  
      Final   Function Getcode (); //  Return Exception Code  
      Final   Function GetFile (); //  Returns the file name with an exception. 
      Final   Function Getline (); //  Returns the line number of the Code with an exception.  
      Final   Function Gettrace (); //  Backtrace () array  
      Final   Function Gettraceasstring (); // Gettrace () information formatted into strings  
 
 /*  Reload Method  */ 
 Function _ Tostring (); //  Output string  
 }
?>

Simple usage: (throws an error message through an exception)

Try{
$ Error= 'My error! ';
Throw New Exception($ Error)
}Catch(Exception $ E){
Echo $ E-> Getmessage ();
}
 

2. We can expand this class to facilitate our use.

 Class Myexception Extends   Exception 
{
 //  Redefines the constructor to change the message to a required attribute. 
      Public   Function _ Construct ( $ Message , $ Code = 0 ){
 //  Custom Code

// Make sure all variables are correctly assigned values  
 Parent ::__ construct ( $ Message , $ Code );
}

 //  Custom string output style 
      Public   Function _ Tostring (){
 Return   _ Class __ .":[{ $ This -> Code}]: { $ This -> Message} \ n ";
}

 Public   Function Customfunction (){
 Echo "A custom function for this type of exception \ n ";
}
}

It can be expanded as needed!