$this keyword refers to the instance from within the class definition
<?php
class Bird
{
function __construct($name, $breed)
{
$this->name = $name;
$this->breed = $breed;
}
}
$tweety = new Bird('Tweety', 'canary');
printf("<p>%s is a %s.</p>\n", $tweety->name, $tweety->breed);
?>
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