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Destroying Objects
You can destroy an object with the following statement:
unset($objName);
For example, you could create and destroy an object of the Car class with the
following statements:
$myCar = new Car;
unset($myCar);
After
$myCar
is unset, the object no longer exists at all.
PHP provides a method that is automatically run when an object is destroyed.
You add this method to your class and call it
__destruct
. For example, the
following class contains a
__destruct
method:
class Bridge
{
function __destruct()
{
echo “The bridge is destroyed”;
}
}
If you use the following statements, the object is created and destroyed:
$bigBridge = new Bridge;
unset($bigBridge);
The output from these statements is:
The bridge is destroyed
The output is echoed by the
__destruct
method when the object is unset.
The
__destruct
method is not required. It’s just available for you to use if
you want to execute some statements when the object is destroyed. For
example, you might want to close some files or copy some information to
your database.
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Part III:Basic PHP Programming
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