variable functions

// http://net.tutsplus.com/tutorials/php/from-procedural-to-object-oriented-php/
// http://us3.php.net/manual/en/functions.variable-functions.php

function foo() {
    echo "This is foo";
}
 
function bar($param) {
    echo "This is bar saying: $param";
}
 
$function = 'foo';
$function();        // Goes into foo()
 
$function = 'bar';
$function('test');  // Goes into bar()