<?php
interface pump {
function get_gas();
}
class premium implements pump {
function get_gas() {
echo "chug..chug..chug!\n<br />\n";
}
}
class regular implements pump {
function get_gas() {
echo "chug..cough..chug..\n<br />\n";
}
}
class mercedes {
function infuse_gas(premium $pump) {
echo "mercedes: ";
$pump->get_gas();
}
}
class pinto {
function infuse_gas(pump $pump) {
echo "pinto: ";
$pump->get_gas();
}
}
$pinto = new pinto;
$pinto->infuse_gas(new premium);
$pinto->infuse_gas(new regular);
$mercedes = new mercedes;
$mercedes->infuse_gas(new premium);
$mercedes->infuse_gas(new regular);
?>
