How to add items to an array while looping through it?

Question

On a foreach loop, it seems PHP reads the whole array at the beginning, so if you suddenly need to append new items to the array they won't get processed by the loop:

$a = array (1,2,3,4,5,6,7,8,9,10);

foreach ($a as $b)
    {
        echo " $b ";
        if ($b ==5) $a[] = 11;
    }

only prints out: 1 2 3 4 5 6 7 8 9 10

Answer 1

Just create a reference copy of the array you are looping

$a = array(1,2,3,4,5,6,7,8,9,10);
$t = &$a; //Copy
foreach ( $t as $b ) {
    echo " $b ";
    if ($b == 5)
        $t[] = 11;
}

Or Just use ArrayIterator

$a = new ArrayIterator(array(1,2,3,4,5,6,7,8,9,10));
foreach ( $a as $b ) {
    echo "$b ";
    if ($b == 5)
        $a->append(11);
}

Output

 1 2 3 4 5 6 7 8 9 10 11

See Live Demo