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POConvert non-nested and bracketed array to nested array
 

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  1. POConvert non-nested and bracketed array to nested array
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    <p>I'm in PHP and I've got an array that looks like this. A single dimension array whose keys are bracketed strings.</p> <pre><code>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', ) </code></pre> <p>Is there any easy way to convert that to a normal nested array, ie:</p> <pre><code>array( 'matrix' =&gt; array( 'min_rows' =&gt; '0', 'max_rows' =&gt; '', 'col_order' =&gt; array('col_new_1'), 'cols' =&gt; array( 'col_new_0' =&gt; array( 'type' =&gt; 'text', 'label' =&gt; 'Cell 1', ....etc.... </code></pre> <p>This is my current solution, but I was wondering if there's something more native or efficient:</p> <pre><code>foreach ($decoded_field_type_settings as $key =&gt; $value) { if (preg_match_all('/\[(.*?)\]/', $key, $matches)) { $new_key = substr($key, 0, strpos($key, '[')); if ( ! isset($field_type_settings[$new_key])) { $field_type_settings[$new_key] = array(); } $array =&amp; $field_type_settings[$new_key]; $count = count($matches[1]) - 1; foreach ($matches[1] as $i =&gt; $sub_key) { if ( ! $sub_key) { if ($i &lt; $count) { $array[] = array(); } else { $array[] = $value; } } else { if ( ! isset($array[$sub_key])) { if ($i &lt; $count) { $array[$sub_key] = array(); } else { $array[$sub_key] = $value; } } } if ($i &lt; $count) { $array =&amp; $array[$sub_key]; } } } else { $field_type_settings[$key] = $value; } } </code></pre> <p>UPDATE: I posted an answer below.</p>
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