PHP/Class/Reflection Invoke

__call: invoke class method dynamically

<?php
class A {
    function getA( ) {
        return array( "A", "B" );
    }
    function setA( $country, $district ) {
        return "$country, $district\n";
    }
}
class Helper {
    private $classA;
    function __construct( A $classA ) {
        $this->classA = $classA;
    }
    function __call( $method, $args ) {
        if ( method_exists( $this->classA, $method ) ) {
            return call_user_func_array(array( $this->classA, $method ), $args );
        }
    }
}
$tool= new Helper( new A() );
print_r( $tool->setA( "UK", "BN" ) );
?>

call_user_func: invoke class method and pass parameters

<?php
class Person {
    private $name;    
    private $age;    
    private $id;    
    function __construct( $name, $age ) {
        $this->name = $name;
        $this->age = $age;
    }
    function setId( $id ) {
        $this->id = $id;
    }
    
    function getId(){
        echo $this->id;    
    }
    
    function __clone() {
        $this->id = 0;
    }
}
$p = new Person("A",10); 
call_user_func( array( $p, "setId" ), 20 );
$p->getId();
?>