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@ 2020-03-03T08:05:44Z

<?php

$data = array( 3 => [4095, 651], 4095 => [3], 651 => [4432], 4432 => [3, 651], 92 => [45], 45 => [92], );
   
function getChildren($ind_ar,$prev_ar,$data, $rem){
     
    $tmp = [];
    $mark = 0;
    foreach($ind_ar as $ind){
         
        foreach($data[$ind] as $new_val){
            
            if(!in_array($new_val,$prev_ar) && $new_val != $ind && $new_val != $rem){
                     
                $mark = 1;
                $tmp[] = $new_val;
            }
                 
            foreach($data[$new_val] as $new){
                if(!in_array($new,$prev_ar) && $new != $ind && $new != $rem){
                     
                    $mark = 1;
                    $tmp[] = $new;
                }
            }
        }
    }
    
    $res_ar = $prev_ar;
       
    if(!empty($tmp)) $res_ar = array_unique(array_merge($tmp,$prev_ar));  
    if($mark) $res_ar = getChildren($tmp,$res_ar,$data, $rem);   
    
    return $res_ar;
}    
      
foreach($data as $in => &$data_val) { 
    $data_val = getChildren([$in],$data_val,$data, $in);
    sort($data_val);
}
     
    print_r($data);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [3] => Array ( [0] => 651 [1] => 4095 [2] => 4432 ) [4095] => Array ( [0] => 3 [1] => 651 [2] => 4432 ) [651] => Array ( [0] => 3 [1] => 4095 [2] => 4432 ) [4432] => Array ( [0] => 3 [1] => 651 [2] => 4095 ) [92] => Array ( [0] => 45 ) [45] => Array ( [0] => 92 ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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