nagoyaphp-160416-sample

nagoyaphp-160416-sample.php

<?php                                                                                                                                                                
                                                                                                                                                                     
$input = '1->4';                                                                                                                                                     
$expected = 'mo';                                                                                                                                                    
                                                                                                                                                                     
// parse                                                                                                                                                             
list($one, $two) = explode('->', $input);                                                                                                                            
                                                                                                                                                                     
$people = [                                                                                                                                                          
    1 => ['parent' => null, 'children' => [2,3,4]],                                                                                                                  
    2 => ['parent' => 1, 'children' => []],                                                                                                                          
    3 => ['parent' => 1, 'children' => []],                                                                                                                          
    4 => ['parent' => 1, 'children' => []],                                                                                                                          
 ];                                                                                                                                                                   
                                                                                                                                                                      
// search                                                                                                                                                            
$onePerson = $people[$one];                                                                                                                                         
$twoPerson = $people[$two];                                                                                                                                         
                                                                                                                                                                      
// mo                                                                                                                                                                
if ($onePerson['parent'] == $two) {                                                                                                                                 
    echo 'mo';                                                                                                                                                       
}                                                                                                                                                                    
                                                                                                                                                                    
// da                                                                                                                                                                
if (in_array($two, $onePerson['children'])) {                                                                                                                       
    echo 'da';                                                                                                                                                       
}