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    copied!<p>I think this should do it...</p> <pre><code>&lt;?php function convert2dTo3d($source) { $refs = array(); $output = array(); foreach ($source AS $key =&gt; $val) { $tok = strtok($key, '[]'); $prev_tok = NULL; while ($tok !== FALSE) { $this_ref =&amp; $refs[$tok]; if ($prev_tok === NULL) $output[$tok] =&amp; $this_ref; else $refs[$prev_tok][$tok] =&amp; $this_ref; $prev_tok = $tok; $tok = strtok('[]'); if ($tok === FALSE) $refs[$prev_tok] = $val; } } return $output; } // Test $source = array( 'matrix[min_rows]' =&gt; '0', 'matrix[max_rows]' =&gt; '', 'matrix[col_order][]' =&gt; 'col_new_1', 'matrix[cols][col_new_0][type]' =&gt; 'text', 'matrix[cols][col_new_1][type]' =&gt; 'text', 'matrix[cols][col_new_0][label]' =&gt; 'Cell 1', 'matrix[cols][col_new_1][label]' =&gt; 'Cell 2', 'matrix[cols][col_new_0][name]' =&gt; 'cell_1', 'matrix[cols][col_new_1][name]' =&gt; 'cell_2', 'matrix[cols][col_new_0][instructions]' =&gt; '', 'matrix[cols][col_new_1][instructions]' =&gt; '', 'matrix[cols][col_new_0][width]' =&gt; '33%', 'matrix[cols][col_new_1][width]' =&gt; '', 'matrix[cols][col_new_0][settings][maxl]' =&gt; '', 'matrix[cols][col_new_0][settings][fmt]' =&gt; 'none', 'matrix[cols][col_new_0][settings][content]' =&gt; 'all', 'matrix[cols][col_new_1][settings][maxl]' =&gt; '140', 'matrix[cols][col_new_1][settings][multiline]' =&gt; 'y', 'matrix[cols][col_new_1][settings][fmt]' =&gt; 'none', 'matrix[cols][col_new_1][settings][content]' =&gt; 'all', ); echo "&lt;pre&gt;"; print_r(convert2dTo3d($source)); echo "&lt;/pre&gt;"; </code></pre>
 

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