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<?php $input[0] = [ [1 => 5, 2 => 12, 11 => 15], [1 => 5, 2 => 12, 11 => 16], [1 => 4, 2 => 9, 11 => 15], [1 => 3, 2 => 9, 11 => 15], [1 => 3, 2 => 9, 11 => 16], [1 => 3, 2 => 13, 11 => 15], [1 => 3, 2 => 13, 11 => 16], [1 => 3, 2 => 12, 11 => 15], [1 => 3, 2 => 12, 11 => 16], [1 => 4, 2 => 9, 11 => 16], [1 => 4, 2 => 13, 11 => 15], [1 => 4, 2 => 13, 11 => 16], [1 => 4, 2 => 12, 11 => 15], [1 => 4, 2 => 12, 11 => 16], [1 => 5, 2 => 9, 11 => 15], [1 => 5, 2 => 13, 11 => 16] ]; $result = []; foreach ($input as $key => $array) { foreach ($array as [1 => $one, 2 => $two, 11 => $eleven]) { $result[$key][$one][$two][] = $eleven; } } var_export($result);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.26, 8.4.1 - 8.4.13
array ( 0 => array ( 5 => array ( 12 => array ( 0 => 15, 1 => 16, ), 9 => array ( 0 => 15, ), 13 => array ( 0 => 16, ), ), 4 => array ( 9 => array ( 0 => 15, 1 => 16, ), 13 => array ( 0 => 15, 1 => 16, ), 12 => array ( 0 => 15, 1 => 16, ), ), 3 => array ( 9 => array ( 0 => 15, 1 => 16, ), 13 => array ( 0 => 15, 1 => 16, ), 12 => array ( 0 => 15, 1 => 16, ), ), ), )
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 ( 0 => array ( 5 => array ( 12 => array ( 0 => 15, 1 => 16, ), 9 => array ( 0 => 15, ), 13 => array ( 0 => 16, ), ), 4 => array ( 9 => array ( 0 => 15, 1 => 16, ), 13 => array ( 0 => 15, 1 => 16, ), 12 => array ( 0 => 15, 1 => 16, ), ), 3 => array ( 9 => array ( 0 => 15, 1 => 16, ), 13 => array ( 0 => 15, 1 => 16, ), 12 => array ( 0 => 15, 1 => 16, ), ), ), )

preferences:
138.35 ms | 411 KiB | 5 Q