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<?php
function sandwatch($size) {
    for( $i = 1; $i<$size; $i++) {
        $array[] = str_repeat('*',$size-$i) . str_repeat('  ',$i). str_repeat('*',$size-$i);
    }
    $array = array_merge([str_repeat('**',$size)],array_reverse($array),$array,[str_repeat('**',$size)]);
    return implode("\n", $array);
}
echo "<pre>" . sandwatch(15) . "</pre>";