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<?php #$str = 'subvar'; #var_dump(explode(':',$str)); exit; $arr = array(); function strAssign(&$arr,$str,$val){ if(!empty($str)){ $str = explode(':',$str); $key = array_shift($str); $arr[$key] = array(); strAssign($arr[$key],implode(':',$str),$val); }else{ $arr = $val; } } strAssign($arr,'var:sub:sub2','value'); var_dump($arr);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { ["var"]=> array(1) { ["sub"]=> array(1) { ["sub2"]=> string(5) "value" } } }

preferences:
213.04 ms | 406 KiB | 307 Q