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<?php $array = [ '.aero', '.airport.aero', '.cargo.aero', '.charter.aero', '.aetna' ]; $result = []; foreach ($array as $value) { if (!preg_match('/(?!^)\..+/', $value, $m)) { $result[$value] = ['tld' => $value, 'gTLD' => []]; } else { $result[$m[0]]['gTLD'][] = $value; } } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'tld' => '.aero', 'gTLD' => array ( 0 => '.airport.aero', 1 => '.cargo.aero', 2 => '.charter.aero', ), ), 1 => array ( 'tld' => '.aetna', 'gTLD' => array ( ), ), )

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