Category "implode"

Transpose multidimensional array and join values with commas

How to group by comma of every value as per same key? I need to re-orientate the array so that rows become columns and the new rows need to be joined together

Implode array with array of glue strings

I have a awkward need but I need to interleave an array with another array before imploding the result. I guess my better option would be less talk more example