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cloning code problem

silverglade

By silverglade
in PHP Coding Help

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silverglade Advanced Member

silverglade

Posted
Posted

Hi, I am trying to clone a car object and nothing outputs to the screen past "error negative gas..." Please any help greatly appreciated. thank you.

 

<html>
<body>
<?php

class Car
{
private $gas = 0;
private function addGas($amount)
{
	$this->gas = $this->gas + $amount;
	echo "<br />$amount gallons added to gas tank<br/>";
}
function buyGas($amount)
{
	$this->addGas($amount);
}
function negativeGas($amount)
{
	$this->gas = $this->gas - 5;
	  try
	  {
		if ($this->gas < 0)
		{
			throw new Exception ("Error, negative amount of gas.");
		}
	   }
	   catch (Exception $e)
	   {
			echo $e->getMessage();
			echo "\n<br/>\n";
			exit();
	   }
}

function __clone()
{
	$this->gas = 0;
	echo "<br/>hello I am a clone!<br/>";
}	
}


$new_car = new Car;
$new_car->buyGas(5);
$another_car = new Car;
$another_car->negativeGas(4);
$clone_car = clone $new_car;
$clone_car->negativeGas(4);
?>
</body>
</html>

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https://forums.phpfreaks.com/topic/242488-cloning-code-problem/
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silverglade Advanced Member

silverglade

Posted
  • Author
Posted

Thank you. I added  return $this to the code and got the same result, it didn't echo out the clone message. please any more advice would be great if you can. here is the changed full code. thanks.

 

<html>
<body>
<?php

class Car
{
private $gas = 0;
private function addGas($amount)
{
	$this->gas = $this->gas + $amount;
	echo "<br />$amount gallons added to gas tank<br/>";
}
function buyGas($amount)
{
	$this->addGas($amount);
}
function negativeGas($amount)
{
	$this->gas = $this->gas - 5;
	  try
	  {
		if ($this->gas < 0)
		{
			throw new Exception ("Error, negative amount of gas.");
		}
	   }
	   catch (Exception $e)
	   {
			echo $e->getMessage();
			echo "\n<br/>\n";
			exit();
	   }
}

function __clone()
{
	$this->gas = 0;
	echo "<br/>hello I am a clone!<br/>";
	return $this;
}	
}


$new_car = new Car;
$new_car->buyGas(5);
$another_car = new Car;
$another_car->negativeGas(4);
$clone_car = clone $new_car;
$clone_car->negativeGas(4);
?>
</body>
</html>

TeNDoLLA Newbie

TeNDoLLA

Posted
Posted

It is not getting cloned because the script will end execution at this line

$another_car->negativeGas(4);

 

There you get negative gas and throw exception and after that you call exit(); So the rest of the script (the cloning part) is not executed at all. It does not require the return $this; in the __clone() function to work.

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