I'm trying to figure out if PHP has the facility to reference containing,
non-parent objects. I have three classes, embedded hierarchically, but which
are NOT extended classes of their containing objects. I'd like to be able to
reference variables in the higher-level objects from the lower-level objects.
To illustrate:
<?php
class Country {
var $name;
var $states;
function Country($name = '', $states = array()) {
$this->name = $name;
$this->states = $states;
}
}
class State {
var $name;
var $cities;
function State($name = '', $cities = array()) {
$this->name = $name;
$this->cities = $cities;
}
}
class City {
var $name;
fuction City($name = '') {
$this->name = '';
}
function name_with_state() {
return "$this->name, " . /* parent node reference */->name;
}
}
$countries = array (
'USA' => new Country('United States',
array (
'WA' => new State('Washington',
array (
'SEA' => new City('Seattle'),
'GEG' => new City('Spokane')
)
),
'CA' => new State('California',
array (
'LAX' => new City('Los Angeles'),
'SFO' => new City('San Francisco')
)
)
)
)
);
echo $countries['USA']->states['WA']->cities['SEA']->name_with_state();
// Output: 'Seattle, Washington'
?>
Obviously, just extending Country doesn't make sense: a State isn't a type of
Country, and a City isn't a type of State -- but States are part of Countries,
and Cities are part of States. Plus, if City was just an extended State (which
in turn is an extended Country), it would contain both a $states and a $cities
variable. Which doesn't make sense.
What, if anything, do I replace /* parent node reference */ with in
City::name_with_state()?
Thanks,
Morgan
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