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    <pre><code>foreach($array1 as $key1=&gt;$value1) { foreach($array2 as $key2=&gt;$value2) { if($value1['row_id']==$value2['row_id']) { if ($value2['vote']) { $result[$key1]['vote']=$value2['vote']; // You're assigning the vote value to a new index of 'vote' on the original array. } else { $result[$key1]['vote'] = 'no vote'; } } } } </code></pre> <p>This is the change that is needed in Ray Cheng's answer.</p> <p>EDIT'd</p> <p>EDIT'd again:</p> <p>When pulling data from a database, you can definitely get the records as an array (look it up, its as old as the hills, the code is out there). The next step is reorganizing the array into the preferred format. <code>FOREACH</code> is ideal for this.</p> <pre><code>// $array1 brought in from some other process $arrayStorage = array(); foreach ($array1 as $row){ $arrayStorage[$row['row_id']] = array('votes'=&gt;$row['votes'], 'comment'=&gt;$row['comment']); } </code></pre> <p>When you want to put it back into the database, reverse it, making sure you pull the keys out again.</p> <pre><code>foreach ($arrayStorage as $row_id=&gt;$row_data){ ... </code></pre> <p>EDIT the LAST:</p> <p>Assuming that both respective databases have been pulled for data into the OP's format...</p> <pre><code>foreach ($array1 as $row){ $arrayStorage[$row['row_id']]['comment'] = $row['comment']; } foreach ($array2 as $row){ $arrayStorage[$row['row_id']]['votes'] = $row['votes']; } $array1 = $arrayStorage; // You are going through $array1 and $array2 and creating a placeholder that is built with the $row_id as an associated structure with a comment and vote for each $row_id. This is your final desired array. </code></pre>
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    1. POHow in PHP to add values from one array to another when their key value pairs match?
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    1. COthanks Malovich, i'm noticing your or Ray Cheng's code starts to break down if `$array1` and `$array2` don't contain the same number of arrays or if they don't perfectly match in `row_id` values. I'd like the output to contain as many arrays as are present in `$array1` and just to assign a value of `"no vote"` if `$value1['row_id']!=$value2['row_id']`. Could you help edit your code to do that? thanks!
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    2. COThe number of array's within each array shouldn't matter; you're iterating through both of them to make the comparison on the `$row_id`. Mind, it would have been superior to simply build both arrays with the `$row_id` as the key to the data. ....also, your suggestion would *overwrite every other array except the one you are handling*!
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    3. COthanks Malkovich, I would like to build the arrays with the `$row_id `as the key to the data if that is easier, I just don't know how to do that either. My output is coming from a MySQL database as a numeric array. I'm using codeigniter for the php and the `result_array()` function http://codeigniter.com/user_guide/database/results.html. Would you mind sharing the php code to build the array with `$row_id` as the key?
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