Problem with variable concatenation

Question

I have a variable in a foreach that picks up the registration id:

$id_inscrito = $this->session->userdata('last_id');

I want to store this variable in another:

$ids_ = $id_inscrito.'|'.$id_inscrito;

Give me the result in the format id1|id2|id3.

How can I do that?

Answer 1

Within your foreach, collect in an array, all Ids, and at the exit of the foreach perform the function implode() PHP to transform into a string with interleaves of the separator you need:

$ids = array();

foreach(????) {
    $ids[] = $this->session->userdata('last_id');
}
echo implode('|', $ids);

Answer 2

Give a read on the function implode of PHP.

If in the variable $this->session->userdata('last_id') returns an array with the ids you want, just do:

$ids = implode('|', $this->session->userdata('last_id'));

And when you echo the variable ids will return exactly what you wanted. I hope to have helped! ;)

Answer 3

You can concatenate the string as @rray put it in the comments:

$ids_ .= $id_inscrito .'|';

Remembering that you should initialize the variable $ids_ before the loop. Another point to consider is that the last id will always be followed by a character |. A more complete solution would be like this:

$ids_ = '';
foreach (...) {
    // codigo

    // se o $ids_ não estiver vazio adiciona '|' antes do próximo id
    $ids_ .= ($ids_ == '') ? $id_inscrito : '|' . $id_inscrito ;
}

---

Another possible way is to use arrays, as @Haroldotorres put in their answer:

$ids_ = array();
foreach (...) {
    // codigo

    $ids_[] = $id_inscrito;
}
$ids_ = implode('|', $ids_);