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POSimple recursive tree in PHP / MySQL
 

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    <p>I have this table in MySQL:</p> <pre><code>id name mother 1 grandma 0 2 myuncle 1 3 mymom 1 4 me 3 5 mysister 3 6 myson 4 7 new_grandma_son 1 </code></pre> <p>I almacenate this info in an array called <code>data[]</code></p> <pre><code>$data=array( array("id"=&gt;1,"name"=&gt;"grandma", "mother"=&gt;0), array("id"=&gt;2,"name"=&gt;"myuncle", "mother"=&gt;1), array("id"=&gt;3,"name"=&gt;"mymom", "mother"=&gt;1), array("id"=&gt;4,"name"=&gt;"me", "mother"=&gt;3), array("id"=&gt;5,"name"=&gt;"mysister", "mother"=&gt;3), array("id"=&gt;6,"name"=&gt;"myson", "mother"=&gt;4), array("id"=&gt;7,"name"=&gt;"new_grandma_son","mother"=&gt;1) ); </code></pre> <p>And for make a family tree I am using this recursive function:</p> <pre><code>function tree($data, $mom = 0, $level = 0){ foreach ($data as $row){ if ($row['mother'] == $mom) { echo str_repeat("-", $level).$row['name']."&lt;br&gt;"; tree($data, $row['id'], $level); } else $level++; } } </code></pre> <p>When I call the function <code>tree($data);</code> it shows this:</p> <pre><code>grandma -myuncle (level 1) -mymom ----me (level 4??) ---------myson (level 9??) ----mysister ----new_grandma_son (level 4??) </code></pre> <p>I have the mistake in the <code>else $level++;</code>, because is adding levels when <code>$row['mother'] != $mom</code>, going through all the rows, but I don't know how to make it. Anyone knows? Thank you.</p> <p><strong>Solution (By Frits van Campen):</strong></p> <pre><code> tree($data, $row['id'], $level+1); // (eliminate this else $level++; ) </code></pre> <p>Thanks!</p>
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