how to generate custome error message $age = 18; try { if try failed, go to else, it has throw , it will call catch, at that it wil execute throw whenever else comes comes to thtrow } and execute in catch catch() { } = 18){ echo ' you can vote'; if it is not age is equalto 18 } else { throw the error as exception with text throw new Exception ('YOU CANT ENTER'); whats we given text } that will catched by catch with catch (Exception $ex){ echo $ex -> getmessage(); automatically get by the message function and loads to ex and prints } ?>

we can use example variables from extend, but we cant use an example with example not reverse possible
<?php
class Example{
public $text = 'welcome to telug computer worlds';
public function display (){
echo '<h2>' .$this -> text. '</h2>';
}
}
class AnExample extends Example{
public $string = 'telugu computer world';
public function displayString (){
return '<h1>' .$this -> string .'</h1>';
}
}
$ae = new AnExample;
echo $ae -> displaystring();
$ex = new Example;
echo $ex ->displaystring();
?>
oop.php
<?php
class BankAccount {
public $balance = 0;
public function displayBalance(){
return 'Balance : '.$this-> balance. '</br> </br>' ;
}
public function deposit($amount){
$this -> balance = $this -> balance + $amount;
}
public function withdraw($amount){
if (($this -> balance)< $amount){
echo 'u cant withdraw more than ur balance';
}
else{$this -> balance = $this -> balance - $amount;}
}}
?>
oop59_2.php
<?php
require 'oop.php';	we can use other page variables using require
class SavingsAccount extends BankAccount {	using extend we can use othr class
}
class CurrentAccount extends BankAccount {
}
$viki_ca = new CurrentAccount;
$viki_ca -> deposit(1000);
$viki_ca -> withdraw(30000);
echo '</br>current account balance '.$viki_ca -> displayBalance();
$viki_sa = new SavingsAccount;
$viki_sa -> deposit(1000);
$viki_sa -> withdraw(500);
echo  '</br>savings  account balance '. $viki_sa -> displayBalance();
?>

how to use other class

how can I declarea objects and properties and how tostore information

hpow to use other page variables to run the obejcts

how to use other cother page variables

how can I use

how to use other class variable without writing whole  code

class

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public function

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public

public function

return

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display

new

display

class

public

public function

return

public funciton

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if else

require

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echo