PHP - multi-d array values changing between foreach loops - php

Question

New PHP user left scratching my head. This function contains two foreach loops nested in if/else the page is index.php. On index.php, the code works fine, and the page shows the last four items in the array.
However, if the page is NOT index.php, the array seems to have been affected by code in between the first and second foreach loop, and only shows as a 1D array with the first-level keys as integers. How do I fix this? I've gone through virtually every PHP documentation I can find with no success.
function list_products_html($products) {
//If page is INDEX.PHP, show only last 4 products in reverse order with PayPal drop-down and Add To Cart
if ($_SERVER['PHP_SELF'] == "index.php") {
$products_reverse = array_reverse($products, true);
$products_new = array_slice($products_reverse, 0, 4, true);
foreach ($products_new as $product_new_id => $product_new) {
echo list_product_html($products_new);
echo generate_paypal_form($products_new);
echo '</li>';
}
//Else, show all products
} else {
foreach ($products as $product_id => $product) {
echo list_product_html($products);
echo generate_paypal_form($products);
echo '</li>';
}
}
}
In the first foreach loop, the var_dump shows my array as the following (which is correct):
array(8) { [101]=> array(5) { ["name"]=> string(15) "Logo Shirt, Red" ["img"]=> string(24) "img/shirts/shirt-101.jpg" ["price"]=> int(18) ["paypal"]=> string(13) "BJDE2BMPHMQ7Q" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [102]=> array(5) { ["name"]=> string(26) "Mike the Frog Shirt, Black" ["img"]=> string(24) "img/shirts/shirt-102.jpg" ["price"]=> int(20) ["paypal"]=> string(13) "2H6VLSYHY3QC8" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [103]=> array(5) { ["name"]=> string(25) "Mike the Frog Shirt, Blue" ["img"]=> string(24) "img/shirts/shirt-103.jpg" ["price"]=> int(20) ["paypal"]=> string(13) "MDP23L74U3F4L" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [104]=> array(5) { ["name"]=> string(17) "Logo Shirt, Green" ["img"]=> string(24) "img/shirts/shirt-104.jpg" ["price"]=> int(18) ["paypal"]=> string(13) "Q39L2XSPANB3Y" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [105]=> array(5) { ["name"]=> string(27) "Mike the Frog Shirt, Yellow" ["img"]=> string(24) "img/shirts/shirt-105.jpg" ["price"]=> int(25) ["paypal"]=> string(13) "7LVQ78CEPSKVN" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [106]=> array(5) { ["name"]=> string(16) "Logo Shirt, Gray" ["img"]=> string(24) "img/shirts/shirt-106.jpg" ["price"]=> int(20) ["paypal"]=> string(13) "G9A9UEVWCTDQN" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [107]=> array(5) { ["name"]=> string(21) "Logo Shirt, Turquoise" ["img"]=> string(24) "img/shirts/shirt-107.jpg" ["price"]=> int(20) ["paypal"]=> string(13) "NNERMRTJSTG6Q" ["sizes"]=> array(4) { [0]=> string(5) "Small" [1]=> string(6) "Medium" [2]=> string(5) "Large" [3]=> string(7) "X-Large" } } [108]=> array(5) { ["name"]=> string(18) "Logo Shirt, Orange" ["img"]=> string(24) "img/shirts/shirt-108.jpg" ["price"]=> int(25) ["paypal"]=> string(13)
In the SECOND foreach loop, I am getting the
"Warning: Invalid argument supplied for foreach()"
error, because var_dump for the same $products array shows the following:
int(101) int(102) int(103) int(104) int(105) int(106) int(107)
int(108)