PHP Exception Handling

1. What is exception handling?

Handling unhealthy states, handling errors

2. Why use exception handling?

Exception handling can help us handle errors more intelligently

3. When do I use exception handling?

Exception handling is used when connecting to the database using PDO

4. How to use exception handling?

1) Exception Handling class: Exception

Method:

GetMessage () Get exception information

GetCode () Get exception number

2) Exception handling classes can be extended to inherit

3) Capture multiple exceptions, to put exception capture in the last

/*try{attempts to perform the first business if the business has an exception, throws an exception if an exception occurs, the first business follow-up will no longer execute ... catch (Exception $e) {handling exception} second business*/Try{    Echo"The alarm clock is ringing, it's time to get up ; //$f =true;    $f=false; if(!$f){        //throws an exception        Throw New Exception("Not Up", 1); }        //If an exception occurs, the code will no longer execute    Echo"Brush your teeth, wash your face ...; }Catch(Exception $e){    //Handling Exceptions    Echo"Exception information:".$e->getmessage (). " ; Echo"Exception number:".$e->getcode (). " ; Echo"Throw exception file path:".$e->getfile (). " ; Echo"The row where the exception was thrown:".$e->getline (). " ;}Echo"Go to Work";

//Extending the default exception class exceptionclassMyExceptionextends Exception{     Public function__tostring () {return Serialize($this); }     Public functionWC () {Echo"A ; }}Try{    Echo"The alarm clock is ringing, it's time to get up ; $f 1=true; //$f 1=false;     if(!$f 1){        //throws an exception        Throw NewMyException ("No time to squat in the toilet", 0); }    Echo $e=Newmyexception; Echo"; Echo $e-WC (); Echo"Brush your teeth, wash your face ...; //$f 2=true;    $f 2=false; if(!$f 2){        //throws an exception        Throw New Exception("Not Up", 1); }    Echo"Breakfast ;}Catch(myexception$e){    //Handling Exceptions    Echo"Exception information:".$e->getmessage (). " ; Echo"Exception number:".$e->getcode (). " ; Echo"Throw exception file path:".$e->getfile (). " ; Echo"The row where the exception was thrown:".$e->getline (). " ;}Catch(Exception $e){    //Handling Exceptions    Echo"Exception information:".$e->getmessage (). " ; Echo"Exception number:".$e->getcode (). " ; Echo"Throw exception file path:".$e->getfile (). " ; Echo"The row where the exception was thrown:".$e->getline (). " ;}Echo"Go to Work";

PHP Exception Handling