3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array(); $arr['01'] = 'sdf'; $arr['09'] = 'sdf2'; $arr['10'] = 'sdf3'; $arr['11'] = 'sdf3'; $arr['jj'] = 'sdf3'; $arr2[1] = 'sdf'; $arr2[9] = 'sdf2'; $arr2[10] = 'sdf3'; $arr2[11] = 'sdf3'; $newArray = array_merge(array(""=>""), $arr); $good_array = array(""=>"") + $arr; print_r($newArray); print_r($good_array);
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [] => [01] => sdf [09] => sdf2 [0] => sdf3 [1] => sdf3 [jj] => sdf3 ) Array ( [] => [01] => sdf [09] => sdf2 [10] => sdf3 [11] => sdf3 [jj] => sdf3 )
preferences:
392.78 ms | 406 KiB | 452 Q