foreach doesn't print altered array properly - php

Question

I am trying to print an array using foreach and while printing, if a certain $key comes up, I want to make changes to the array. Problem is, even though the array gets changed, the changes do not get printed.
In the example below, you will find:
function I use to change the array;
an array first printed with no changed;
then echo print-out in with changes during the process - all using foreach;
another print-out of the same table, but this time with changes.
<?php
function insert_before_key($array, $key, $data = NULL){
if (($offset = array_search($key, array_keys($array))) === false){
$offset = count($array);
}
return array_merge(array_slice($array, 0, $offset), (array) $data, array_slice($array, $offset));
}
$array = array(
"no_color" => "blank",
"color1" => "red",
"color2" => "green",
"color3" => "blue",
);
echo "<pre>";
print_r($array);
echo "</pre>";
foreach ($array as $key => $value) {
echo $key . ": " . $value . "<br />";
if ($key === "color1"){
$array = insert_before_key($array, "color2", array("color1.5" => "yellow"));
}
}
echo "<pre>";
print_r($array);
echo "</pre>";
echo "<br />";
?>
Note that the new $key is to jump in AFTER current $key, so I would expect it to come up.
Any idea why this happens ?
EDIT:
Played a bit more with foreach and I think it must be caching the keys or something...
<?php
$test_array = array(0,1,2,3,4,5,6,7,8,9);
foreach ($test_array as $key => $value) {
if ($key === 5){$test_array[7] = $test_array[7]+1;}
echo $key . ": " . $value . "<br />";
}
print_r($test_array);
?>
The above will display UNCHANGED echo, but CHANGED print_r.

Answer 1

From the manual: "As foreach relies on the internal array pointer, changing it within the loop may lead to unexpected behavior." http://php.net/manual/en/control-structures.foreach.php
You shouldn't modify an array you're looping over.

Answer 2

So during iteration you are trying to change the value of the item being iterated
foreach($array ...)
{
change $array
}
Use a copy of $array inside the iteration
$array2 = $array
foreach($array ...)
{
change $array2
}

Answer 3

I'd keep it simple. Something tells me however that you're fixing effects of a problem here and not its source.
$array = array(
"no_color" => "blank",
"color1" => "red",
"color2" => "green",
"color3" => "blue",
);
$temp_array = array();
foreach ($array as $key => $value) {
$temp_array[$key] = $value;
echo $key . ": " . $value . "<br />";
if ($key == 'color1') {
$key_add = 'color1.5';
$value_add = 'yellow';
$temp_array[$key_add] = $value_add;
echo $key_add . ": " . $value_add . "<br />";
}
}
$array = $temp_array;