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jimmmy dot chief at gmail dot com ¶

8 years ago

Hi, i would like to point out difference between self::CONST and $this::CONST with extended class.
Let us have class a:

<?php 
class a {    
    const CONST_INT = 10;
    
    public function getSelf(){
        return self::CONST_INT;
    }
    
    public function getThis(){
        return $this::CONST_INT;
    }
}
?>

And class b (which extends a)

<?php
class b extends a {
    const CONST_INT = 20;
    
    public function getSelf(){
        return parent::getSelf();
    }
    
    public function getThis(){
        return parent::getThis();
    }
}
?>

Both classes have same named constant CONST_INT.
When child call method in parent class, there is different output between self and $this usage.

<?php
$b = new b();

print_r($b->getSelf());     //10
print_r($b->getThis());     //20

?>

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