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copied!<p>Here's what I came up with... It's not a quite efficient approach, but maybe somebody could turn it into a fancy recursive function to make it abstract - I've tried a little, but I really suck at recursions :-P</p> <pre><code>function cascade_array ($array, $current_level = 1) { // filter only the array elements with the level==current_level $chunks = array_filter ($array, function ($v) use ($current_level) { return $v['level'] == 1; } ); // extract the keys from those elements an put them in reverse order $splice_keys = array_reverse(array_keys($chunks)); // now splice the array at those keys and put the // array-parts in a result-array, so you have an array of e.g. all level1 foreach ($splice_keys as $offset) { $results[] = array_splice($array, $offset); } //now walk through the results and basically do the same foreach($results as &$level) { $level[0]['children'] = array(); $array = array_splice($level, 1); $chunks = array_filter ($array, function ($v) use ($current_level) { return $v['level'] == 2; } ); $splice_keys = array_reverse(array_keys($chunks)); foreach($splice_keys as $offset) { $level[0]['children'][] = array_splice($array, $offset); } foreach($level[0]['children'] as &$child_level) { $child_level[0]['children'] = array(); $array = array_splice($child_level, 1); $chunks = array_filter ($array, function ($v) use ($current_level) { return $v['level'] == 3; } ); $splice_keys = array_reverse(array_keys($chunks)); foreach($splice_keys as $offset) { $child_level[0]['children'][] = array_splice($array, $offset); } } } return $results; } </code></pre> <p>The code is actually pretty straight forward, I guess. Here's a working example: <a href="http://codepad.viper-7.com/kb5JBc" rel="nofollow">http://codepad.viper-7.com/kb5JBc</a> - I hope it helps :)</p>

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