<?php $array = [ [ 'key_1' => 'FOO', 'key_2' => 'FTU-1', 'cats' => '/30/' ], [ 'key_1' => 'FOO', 'key_2' => 'FTU-2', 'cats' => '/30/' ], [ 'key_1' => 'FOO', 'key_2' => 'FTU-3', 'cats' => '/30/10/' ], [ 'key_1' => 'FOO', 'key_2' => 'FTU-4', 'cats' => '/15/' ], [ 'key_1' => 'FOO', 'key_2' => 'FTU-5', 'cats' => '/10/' ], [ 'key_1' => 'FOO', 'key_2' => 'FTU-6', 'cats' => '/15/' ], ]; $result = []; foreach ($array as $row) { foreach (explode('/', trim($row['cats'], '/')) as $cat) { $result[$cat][] = $row; } } var_export($result);
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Value for `_results` contains invalid data `array`