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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
<?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();
}
?>Output
Following output is displayed
Division by 0 in line no 19
Change any one of varibles to non-numeric value
error : Non numeric data in line no 20
If both variables are numbers, their division is printed
Updated on: 18-Sep-2020
411 Views
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