PHP Nested Exception

Introduction

Blocks of try - catch can be nested upto any desired levels. Exceptions will be handled in reverse order of appearance i.e. innermost exception processing is done first.

Example

In following example,inner try block checks if either of two varibles are non-numeric, nd if so, throws a user defined exception. Outer try block throws DivisionByZeroError if denominator is 0. Otherwise division of two numbers is displayed.

Example

Live Demo

<?php
class myException extends Exception{
   function message(){
      return "error : " . $this->getMessage() . " in line no " . $this->getLine();
   }
}
$x=10;
$y=0;
try{
   if (is_numeric($x)==FALSE || is_numeric($y)==FALSE)
      throw new myException("Non numeric data");
}
catch (myException $m){
   echo $m->message();
   return;
}
if ($y==0)
   throw new DivisionByZeroError ("Division by 0");
echo $x/$y;
}
catch (DivisionByZeroError $e){
   echo $e->getMessage() ."in line no " . $e->getLine();
}
?>