dellow

/**
 * in_arrayi
 * Case insensitive in_array().
 *
 * @since 1.0.0
 * @version 1.0.0
**/
function in_arrayi($needle, $haystack){
    return in_array(strtolower($needle), array_map('strtolower', $haystack));
}

dellow

/**
 * array_flatten
 * Flattens any array.
 *
 * @since 1.0.0
 * @version 1.0.0
**/
function array_flatten($array){
    $return = array();
    array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; });

dellow

/**
 * p
 * Better print_r() for debugging purposes.
 *
 * @since 1.0.0
 * @version 1.0.0
**/
function p($data){
    $debug = debug_backtrace();