Question

What’s the fastest (best performing) way in PHP to transform a (My)SQL result like:

array(  array('user_name' => 'john', 'tag_id' => 1, 'tag_name' => 'foo'),  array('user_name' => 'john', 'tag_id' => 2, 'tag_name' => 'bar'),  array('user_name' => 'rick', 'tag_id' => 3, 'tag_name' => 'foobar'),  array('user_name' => 'rick', 'tag_id' => 2, 'tag_name' => 'bar') ); 

Into the easier to use:

array(  array('name' => 'john', 'tags' => array(   array('id' => 1, 'name' => 'foo'),   array('id' => 2, 'name' => 'bar')  ),  array('name' => 'rick', 'tags' => array(   array('id' => 3, 'name' => 'foobar'),   array('id' => 2, 'name' => 'bar')  ) ); 

Or is there a library that does this already, without the added inflexibility and performance hit of full ORM?

Thanks

Answer 1

Try this:

$data = array(     array('user_name' => 'john', 'tag_id' => 1, 'tag_name' => 'foo'),     array('user_name' => 'john', 'tag_id' => 2, 'tag_name' => 'bar'),     array('user_name' => 'rick', 'tag_id' => 3, 'tag_name' => 'foobar'),     array('user_name' => 'rick', 'tag_id' => 2, 'tag_name' => 'bar') ); $final = array(); foreach ($data as $item) {     if (!isset($final[$item['user_name']])) {         $final[$item['user_name']] = array(             'name' => $item['user_name'],             'tags' => array()         );     }     $final[$item['user_name']]['tags'][] = array(         'id'   => $item['tag_id'],         'name' => $item['tag_name']     ); } $final = array_values($final);