<?php // Connect to the mysql server $mysqli = new mysqli('localhost', $env['username'], $env['password'], $env['database']); if ($mysqli->connect_errno) { echo 'Failed to connect'; } echo $mysqli->host_info . "\n"; // SQL query to join 3 tables based on item ID. // This will return one row for each permutation of data. // Note that the column 'desc' in the OPs question has been replaced with 'description' // to avoid a naming conflict with a MYSQL keyword. $res = $mysqli->query("select distinct a.id, a.item, a.description, b.metakey, b.metavalue, c.name from a join b on a.id = b.item_id join c on a.id = c.item_id order by a.item"); print_r($res); // Transform the mysql output which contains duplicate information // into the desired data structure as specified in the OPs question. $output = []; while($row = $res->fetch_assoc()) { // We need to use the row ID (Item ID) to process the mysql rows. // Only add the full row if the Item ID has not previously been added. if (!isset($output[$row['id']])) { // Form the desired data structure $output[$row['id']] = [ "DATA" => [ // The data array is an indexed array. $row['item'], $row['description'], ], "META" => [ // The meta array is an associative array and uses key value pairs. $row['metakey'] => $row['metavalue'], ], // The extra array is an indexed array. "EXTRA" => [ $row['name'], ], ]; } // Here we fill in the missing data from the partially duplicated mysql rows. // We drill down into the output array to check which keys have been added already, // and if it hasn't been added we add it. if (!isset($output[$row['id']]['META'][$row['metakey']])){ $output[$row['id']]['META'][$row['metakey']] = $row['metavalue']; } // Same again, but a slightly different check. This time we are dealing with // an indexed array so we need to see if the value has been added. if (!in_array($row['name'], $output[$row['id']]['EXTRA'])) { $output[$row['id']]['EXTRA'][] = $row['name']; } } print_r($output);
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Create Array from Duplicate Rows after Joining Tables (example)
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- Written by Timothy Johns
- Category: PHP / MySQL
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