why does the php code only fetch one digit from my two-digits-ids in the database?

Question

Let's say my database's table has 11 entries, so 11 ids from 1 to 11. The following could would echo 12345678911 - it cuts off the last digit of 10 and 11 . I wonder why and more than anything: How can I fix this?

foreach($resultholeIdVonAutorenWerke as $row) {
    $autor_werk_id = $row['id'];

    $test .= "$autor_werk_id[0]";
}

echo $test

Answer 1

Because you specifically only access the first character. $autor_werk_id is string, not an array. When you use array syntax on a string it will return the character you specify from that string. In your case the first character because you use a key of zero.

Here's an example :

$string = '1234567890';
echo $string[5]; // Outputs 6

Remove that portion of code and it will work just fine:

foreach($resultholeIdVonAutorenWerke as $row) {
   $autor_werk_id = $row['id'];

   $test .= $autor_werk_id; 
}

echo $test;

Answer 2

Instead of looping you can implode the result to a string.

$ids = array_column($resultholeIdVonAutorenWerke, "id");
echo implode("", $ids); //1234567891011

Array_column grabs one column from the array and implode glues together the array items with the glue (in this case "", nothing)