PHP Manual
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III. Language Reference

Table of Contents
9. Basic syntax
10. Types
11. Variables
12. Constants
13. Expressions
14. Operators
15. Control Structures
16. Functions
17. Classes and Objects (PHP 4)
18. Classes and Objects (PHP 5)
19. References Explained
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How to change configuration settings Basic syntax
nt color="#007700">{
    function example() {
        echo "I am B::example() and provide additional functionality.<br />\n";
        parent::example();
    }
}

$b = new B;

// This will call B::example(), which will in turn call A::example().
$b->example();
?>