3v4l.org

run code in 300+ PHP versions simultaneously
<?php $targetArray = array('a'=>'','b'=>'','c'=>'','d'=>''); $sourceArray = array('a'=>'a','c'=>'c','d'=>'d'); var_export(array_replace($targetArray, $sourceArray)); var_export($sourceArray + $targetArray);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 'a' => 'a', 'b' => '', 'c' => 'c', 'd' => 'd', )array ( 'a' => 'a', 'c' => 'c', 'd' => 'd', 'b' => '', )
preferences:
106.14 ms | 407 KiB | 5 Q