$rows = get_field('books', 34);
if (!empty($rows)) {
$max_to_show = 2;
$row_count = count($rows);
$shown_rows = array();
$i = 0;
for ($loop=0; $loop<$max_to_show; $loop++) {
// show 2 images
if ($row_count > $max_to_show) {
// only randomize if more than max to show
$i = rand(0, $row_count - 1);
while (in_array($i, $shown_rows)) {
// make sure it's not duplicate
$i = rand(0, $row_count - 1);
}
} // end if > max to show
// ********************************
// output row $i here
// ********************************
$shown_rows[] = $i;
if ($row_count <= $max_to_show) {
// increment value in cases rows is <= max to show
$i++;
if ($i >= $row_count) {
// make sure that we don't exceed number of rows that exist
break;
}
}
} // end for
} // end if rows
