Online PHP editor | output for KgeNr

<?php function key_values($key) { if ($key[0] == '>') { [$lower, $upper] = [substr($key, 1), 'INF']; } else { [$lower, $upper] = explode('-', $key); } return [$lower, $upper]; } function convert_slabs($slabs) { $bounds = array(); $last_value = reset($slabs); [$lb, $ub] = [$lower, $upper] = key_values(key($slabs)); while ($value = next($slabs)) { [$lower, $upper] = key_values(key($slabs)); // new entry required? if ($value != $last_value) { $bounds[] = (object)['lb' => $lb, 'ub' => $ub, 'value' => $last_value]; [$lb, $ub] = [$lower, $upper]; $last_value = $value; } else { // no, just extend the upper bound $ub = $upper; } } // add the last object $bounds[] = (object)['lb' => $lb, 'ub' => $ub, 'value' => $last_value]; return $bounds; } $slabs_array = array( [ '0-300' => 2.5, '300-500' => 2.5, '500-1000' => 2.5, '1000-5000' => 2.4, '>5000' => 2.4 ], [ '0-300' => 1.2, '300-500' => 1.2, '500-1000' => 1.2, '1000-5000' => 1.3, '>5000' => 1.4 ], [ '0-300' => 2.5, '300-500' => 2.5, '500-1000' => 2.5, '1000-5000' => 2.5, '>5000' => 2.5 ], [ '0-300' => 4.5, '300-500' => 2.5, '500-1000' => 2.5, '1000-5000' => 2.5, '>5000' => 3.5 ], [ '0-300' => 4.5, '300-500' => 3.5, '500-1000' => 3.5, '1000-5000' => 3.5, '>5000' => 3.5 ], [ '0-300' => 1.5, '300-500' => 2.5, '500-1000' => 2.5, '1000-5000' => 2.5, '>5000' => 1.5 ], [ '0-300' => 1.5, '300-500' => 2.5, '500-1000' => 3.5, '1000-5000' => 2.5, '>5000' => 3.5 ], [ '0-300' => 1.5, '300-500' => 2.5, '500-1000' => 2.5, '1000-5000' => 1.5, '>5000' => 1.5 ] ); foreach ($slabs_array as $slabs) { $result = convert_slabs($slabs); echo json_encode($result, JSON_PRETTY_PRINT) . PHP_EOL . PHP_EOL; }