Store values ​​in multidimensional array using php

Question

I use while loop

      $i = 0;
      $arr = array();
      while($get_key1 = mysql_fetch_assoc($get_key))
      {
        $busid = $get_key1['busid'];
        $get_key2 = mysql_query("select * from `route` where `busid`='$busid'") or die(mysql_error());

        while($get_key3 = mysql_fetch_assoc($get_key2))
        {
            $arr[$i] = $get_key3['routid'];
            echo "<pre>";
            print_r($arr);
        }
        echo "<hr/>";
        $i++;
      }

This inner loop gives three values 1,3,4, and when it repeats again, it gives values 1,4I want to create a multidimensional array as

array(array(1,3,4),array(1,4))

but the above code gives the result as:

Array
(
    [0] => 1
)

Array
(
    [0] => 1
    [1] => 3
)

Array
(
    [0] => 1
    [1] => 3
    [2] => 4
)

Array
(
    [0] => 1
    [1] => 3
    [2] => 4
    [3] => 1
)

Array
(
    [0] => 1
    [1] => 3
    [2] => 4
    [3] => 1
    [4] => 4
)

How to store values ​​through a while loop in a multidimensional array

Answer 1

You need to use it $ias an external array and create an internal index of the array itself.

while($get_key3 = mysql_fetch_assoc($get_key2))
{
    $arr[$i][] = $get_key3['routid']; // simple change
    echo "<pre>";
    print_r($arr);
}