Use strtoupper into implode?

Question

Is it possible to do use strtoupper or other functions into implode ?

Something like that ?

$labelsString = implode(':', strtoupper($this->labels));

Or do I have to use foreach ?

Answer 1

Array_map() helps you: it apply function to all array elements, then return result array, which you can pass to implode function:

$labelString = implode(':', array_map('strtoupper', $this->labels));

Answer 2

implode needs array input string implode ( string $glue , array $pieces )

but string strtoupper ( string $string ) return string.

So you need to convert the output of strtoupper from string to array. Then you can pass it to implode.