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run code in 200+ php & hhvm versions
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<?php $input = [ 'a.b.c.d = 1', 'a.b.c.e = Joey', 'a.b.c.f = Smith', 'a.b.g.d = 2', 'a.b.g.e = Chris', 'a.b.g.f = Divner' ]; $data = []; $cleanKeys = []; foreach($input as $record) { $equals = strrpos($record, '='); $value = trim(substr($record, $equals+1)); $key = trim(substr($record, 0, $equals)); $lastDot = strrpos($key, '.'); $appKey = substr($key, $lastDot+1); $curKey = substr($key, 0, $lastDot); $data[$curKey][$appKey] = $value; if (strpos($curKey, '.') !== FALSE) { $cleanKeys[] = $curKey; } } foreach($data as $k => $v){ $keys = explode('.', $k); $firstKey = array_shift($keys); $newData = []; while($key = array_pop($keys)) { if (count($newData) === 0) { $newData[$key] = $v; } else { $newData = [$key => $newData]; } } $data = array_merge_recursive($data, $newData); unset($data[$k]); } echo var_export($data);
based on lWECX

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Typed properties v2
array ( 'b' => array ( 'c' => array ( 'd' => '1', 'e' => 'Joey', 'f' => 'Smith', ), 'g' => array ( 'd' => '2', 'e' => 'Chris', 'f' => 'Divner', ), ), )
Output for Array change keys
array ( 'b' => array ( 'c' => array ( 'd' => '1', 'e' => 'Joey', 'f' => 'Smith', ), 'g' => array ( 'd' => '2', 'e' => 'Chris', 'f' => 'Divner', ), ), )
Output for Lexical anon
array ( 'b' => array ( 'c' => array ( 'd' => '1', 'e' => 'Joey', 'f' => 'Smith', ), 'g' => array ( 'd' => '2', 'e' => 'Chris', 'f' => 'Divner', ), ), )

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page