Online PHP editor | output for Ml6Yg

@ 2017-02-13T07:55:18Z

<?php

$rows = [
  ['cat' => 'guest', 'name' => 'name_one', 'y' => '2016', 'q' => '2', 'st' => 1],
  ['cat' => 'guest', 'name' => 'name_one', 'y' => '2017', 'q' => '3', 'st' => 2],
  ['cat' => 'guest', 'name' => 'name_two', 'y' => '2017', 'q' => '1', 'st' => 1],
  ['cat' => 'guest', 'name' => 'name_two', 'y' => '2017', 'q' => '2', 'st' => 2],
];

$data = [];
foreach ($rows as $row) {
  $link = &$data;
  foreach (['cat', 'name', 'y'] as $field) {
      if (!isset($link[$row[$field]])) $link[$row[$field]] = [];
      $link = &$link[$row[$field]];
  }
  $link[$row['q']] = $row['st'];
  unset($link);
}
print_r($data);

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Array ( [guest] => Array ( [name_one] => Array ( [2016] => Array ( [2] => 1 ) [2017] => Array ( [3] => 2 ) ) [name_two] => Array ( [2017] => Array ( [1] => 1 [2] => 2 ) ) ) )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [guest] => Array ( [name_one] => Array ( [2016] => Array ( [2] => 1 ) [2017] => Array ( [3] => 2 ) ) [name_two] => Array ( [2017] => Array ( [1] => 1 [2] => 2 ) ) ) )

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