How to use a callback in PHP

PHP callbacks

function aCallback($param1, $param2){
	print "I am a callback";
	print "\n";
	print_r( $param1 );
	print "\n";
	print_r( $param2 );
	print "\n";
	print "End of the calback";
	print "\n";
}

function myFunction( $callback, $p1, $p2="default value" ){
	print "doing things inside the function";
	print "\n";
	$callback($p1, $p2);
	print "you can do things here as well";
	print "\n";
}


$p1 = array("one", "two", "three");
$p2 = "Caramba!";

myFunction( 'aCallback', $p1);
myFunction( 'aCallback', $p1, $p2);

PHP Callbacks execution output

Miguel at 12:15 in path ~/Desktop
$ php test.php 
doing things inside the function
I am a calback
Array
(
    [0] => one
    [1] => two
    [2] => three
)

default value
End of the calback
you can do things here as well
doing things inside the function
I am a calback
Array
(
    [0] => one
    [1] => two
    [2] => three
)

Caramba!
End of the calback
you can do things here as well