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  1. <?php
  2.  
  3. function make_regexp($x) {
  4.      $keys = explode(':', $x);
  5.      $last = "(?P<" . array_pop($keys) . ">.+)";
  6.      array_walk($keys, function(&$v, $k) { $v = "(?P<$v>[^:]+)";});
  7.      array_push($keys, $last);
  8.      return '#^' . implode(':', $keys) . '$#';
  9. }
  10.  
  11. function slice($a, $key) {
  12.     return array_filter($a, function($k)use($key) {return in_array($k, explode(':', $key));}, ARRAY_FILTER_USE_KEY);
  13. }
  14.  
  15. function f($a) {
  16.     $keys = implode(':', array_keys($a));
  17.     if(preg_match(make_regexp('a:b:lst'), $keys, $matches)) {
  18.         return array_merge(slice($a, $matches['b']), f(slice($a, $matches['lst'])));
  19.     }
  20.  
  21.     if(preg_match(make_regexp('a:b'), $keys, $matches)) {
  22.         return [$a[$matches['b']]];
  23.     }
  24.  
  25.     return [];
  26. }
  27.  
  28. echo implode(' ', f(['Хорошо','живёт','на свете','Винни-пух']));
  29.  
Success #stdin #stdout 0.02s 24548KB
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stdin
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Standard input is empty
stdout
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живёт Винни-пух
https://ideone.com/D3cVIA
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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