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<?php $groupByCols = ['a', 'b']; $rows = [ [ 'a' => 1, 'b' => 10, 'c' => 100 ], [ 'a' => 1, 'b' => 20, 'c' => 200 ], [ 'a' => 1, 'b' => 20, 'c' => 300 ], [ 'a' => 1, 'b' => 30, 'c' => 400 ], [ 'a' => 2, 'b' => 40, 'c' => 500 ], [ 'a' => 2, 'b' => 50, 'c' => 600 ], [ 'a' => 3, 'b' => 60, 'c' => 700 ] ]; function group_by($array, $columns) { $new_arr = array(); $column = array_shift($columns); foreach ($array as $arr) { $new_arr[$arr[$column]][] = $arr; } if (count($columns)) { foreach ($new_arr as &$arr) { $arr = group_by($arr, $columns); } } return array_values($new_arr); } print_r(group_by($rows, $groupByCols));
Output for 5.6.38, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 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 ( [0] => Array ( [0] => Array ( [0] => Array ( [a] => 1 [b] => 10 [c] => 100 ) ) [1] => Array ( [0] => Array ( [a] => 1 [b] => 20 [c] => 200 ) [1] => Array ( [a] => 1 [b] => 20 [c] => 300 ) ) [2] => Array ( [0] => Array ( [a] => 1 [b] => 30 [c] => 400 ) ) ) [1] => Array ( [0] => Array ( [0] => Array ( [a] => 2 [b] => 40 [c] => 500 ) ) [1] => Array ( [0] => Array ( [a] => 2 [b] => 50 [c] => 600 ) ) ) [2] => Array ( [0] => Array ( [0] => Array ( [a] => 3 [b] => 60 [c] => 700 ) ) ) )
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 ( [0] => Array ( [0] => Array ( [a] => 1 [b] => 10 [c] => 100 ) ) [1] => Array ( [0] => Array ( [a] => 1 [b] => 20 [c] => 200 ) [1] => Array ( [a] => 1 [b] => 20 [c] => 300 ) ) [2] => Array ( [0] => Array ( [a] => 1 [b] => 30 [c] => 400 ) ) ) [1] => Array ( [0] => Array ( [0] => Array ( [a] => 2 [b] => 40 [c] => 500 ) ) [1] => Array ( [0] => Array ( [a] => 2 [b] => 50 [c] => 600 ) ) ) [2] => Array ( [0] => Array ( [0] => Array ( [a] => 3 [b] => 60 [c] => 700 ) ) ) )

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