[php]
function get_apple($num){
return ‘In get_apple(),we nees ‘.$num.’boxes’;
}

function get_orange($num){
return ‘In get_orange(),we nees ‘.$num.’boxes’;
}

function print_str($str){
echo $str,’\n’;
}

$f1 = ‘get_apple’;
echo $f1(2);
$f1 = ‘get_orange’;
echo $f1(3);

function get_fruit($fruit,$num){
$opt = ‘get_’.$fruit;
return $opt($num);
}

echo get_fruit(‘apple’,6);
[/php]