Good
<?php
function &us_states() {
        global 
$US_STATES;
        if(
count($US_STATES)) {
                return 
$US_STATES;
        }
        
$US_STATES['al'] = 'Alabama';
        
/* ... */
        
$US_STATES['wy'] = 'Wyoming';
        return 
$US_STATES;
}

function 
country_abbrs() {
    global 
$COUNTRY_ABBRS;
        if(
count($US_STATES)) {
                return 
$US_STATES;
        }
        
$COUNTRY_ABBRS['al'] = 'Albania';
        
/* ... */
        
$COUNTRY_ABBRS['zi'] = 'Zimbabwe';
        return 
$COUNTRY_ABBRS;
}
$states =& us_states();
?>