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Code Issues Releases Wiki Activity

Working on inheritance page

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Andrew Davis
2018-09-02 23:09:35 -05:00
parent 244ce2c01f
commit e404ab5489
4 changed files with 93 additions and 6 deletions
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23
code/classes-visibility.php
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@@ -33,11 +33,28 @@ class Phone2
}
}
// The "protected" and "private" keywords work a little differently, but we
// will learn more about "protected" when we discuss inheritance.
// However, they both prevent functions and properties from being accessed outside an object.
// The "protected" and "private" keywords work a little differently.
// They both prevent functions and properties from being accessed outside an object.
// However, a method or property marked "protected" can still be accessed by a child object.
class Phone3
{
private $number;
protected $caller;
public function setNumber($number)
{
$this->number = $number;
}
}
// In class "Smartphone", the "caller" property is accessible because the parent class
// has it marked as "protected". However, "Smartphone" cannot access the the "number" property
// because it is still listed as private.
class Smartphone extends Phone3
{
public function setCaller($caller)
{
$this->caller = $caller;
}
}