<?php ini_set('display_errors', 1); error_reporting(E_ALL); $db_results = [ ['cat' => 1, 'id' => 1], ['cat' => 1, 'id' => 2], ['cat' => 2, 'id' => 3], ['cat' => 1, 'id' => 4] ]; $category_map = []; foreach ( $db_results as $row ) { $category_map[ $row['cat'] ][ $row['id'] ] = $row; } print_r($category_map);
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