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PORecursive PHP function for adjacency-list display
 

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  1. PORecursive PHP function for adjacency-list display
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    <p>I have a DB like so:</p> <pre><code>id text parent 1 Parent 1 0 2 Child of 1 1 3 Sibling 1 4 Another Parent 0 5 A first child 4 </code></pre> <p>So I'm trying to capture a tree structure my listing the parents. I'm aware of the other option (nested sets I think?) but I'm going to stick with this for now. I'm now trying to get the data out of the DB and into a nested array structure in PHP. I have a function like this:</p> <pre><code>class Data_Manager { public $connection = ''; public $collection = array(); function __construct() { $this-&gt;connection = mysql_connect('localhost', 'root', 'root'); $thisTable = mysql_select_db('data'); // error handling truncated } function get_all() { $arr = &amp;$this-&gt;collection; $this-&gt;recurseTree('', 0, $arr); var_dump($arr); } function recurseTree($parent, $level, $arrayNode) { $result = mysql_query('SELECT * FROM tasks WHERE parent="' . $parent . '";'); while ($row = mysql_fetch_array($result)) { $row['children'] = array(); //where I'd like to put the kids $arrayNode[$row['id']]= $row; $this-&gt;recurseTree($row['id'], $level+1, $arrayNode[$row['id']]); } } } </code></pre> <p>So what I'd like to come out with is some kind of nested tree of associative arrays, but I can't figure out quite how to do that. Nothing seems to be writing to the array I pass in, and I'm sort of losing track of myself in the recursion. Can anyone help get me over this last hump that will result in something like:</p> <pre><code>[ Parent1 =&gt; [ children =&gt; ['Child of 1', 'Sibling'] ], AnotherParent =&gt; [ children =&gt; ['First Child'] ] ] </code></pre> <p>And I'm less concerned with the specific form of the output. It will be turned into JSON and I haven't dealt with writing up the client-side handler yet, so no worries on exact structure.</p> <p>Thanks!</p>
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    1. USAlex Mcp
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    1. COhave you tried passing by reference?
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    2. COI do when I pass in the original instance variable $collection; I don't know much about how that works, but should I use that all through recursion to always edit the 'mother' array?
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    3. COsee http://stackoverflow.com/questions/3627878/php-mysql-retrieve-a-single-path-in-the-adjacency-list-model for a lot of reference
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