array_combine same key code example
Example: array merge with same key in php
Input : $a1=array("a"=>"raj", "b"=>"striver");
$a2=array("z"=>"geeks", "b"=>"articles");
Output :
Array
(
[a] => raj
[b] => Array
(
[0] => striver
[1] => articles
)
[z] => geeks
)