my Codeigniter common helper

common_helper.php

<?php (defined('BASEPATH')) OR exit('No direct script access allowed');

function test($x,$exit=0)
{
  echo $res = "<pre>";
  if(is_array($x) || is_object($x)){
		echo print_r($x);
	}else{
		echo var_dump($x);
	}
	echo "</pre><hr />"; 
	if($exit==1){ die(); }
}

function clean_string($str)
{
	$str = str_replace('\"','"', $str);
	$str = str_replace("\'","'", $str);
	return $str;
}

function asset_url($path = '')
{
	$ci =& get_instance();
	return config_item('asset_url').$path;
}

function twitter_time($time)
{
	$t = date_parse($time);	
	$t = mktime($t['hour'],$t['minute'],$t['second'],$t['day'],$t['month'],$t['year']);
	$t = date('j M Y, H:i',$t); 
	return $t;
}

function twitter_time_to_db($time)
{
	$t = date_parse($time);	
	$t = mktime($t['hour'],$t['minute'],$t['second'],$t['day'],$t['month'],$t['year']);
	$t = date('Y-m-d, H:i:s',$t); 
	return $t;
}

function twitter_age($time)
{
	$t = date_parse($time);	
	$a = new DateTime($t['year'].'-'.$t['month'].'-'.$t['day']);
	test(date_diff($a, '2011-01-01')); exit;
	$t = mktime($t['hour'],$t['minute'],$t['second'],$t['day'],$t['month'],$t['year']);
	$t = date_diff(time() - $t);
	return $t;
}

function jsout($output)
{
	header('Content-type: application/json');
	exit( json_encode( $output ) );
}

function goingto($url='')
{
	if($url == '') $url = BASE_URL;
	header('location: '.$url);
	exit;
}

function send_email($to, $from, $subject, $message)
{
	$ci =& get_instance();
	
	$ci->load->library('Email');
	$email = $ci->email;

	$email->from($from);
	$email->to($to);
	$email->subject($subject);
	$email->message($message);

	return $email->send();
}

function do_session($act,$key,$data = array())
{
	$ci =& get_instance();
	switch($act)
	{
		case 'get':
			$tmp = $ci->session->userdata($key);
			$ci->session->unset_userdata($key);
			return $tmp;
			break;
		case 'set':
			$ci->session->set_userdata($key,$data);
			break;
		default: exit('Invalid do session');
	}
}

function load_errors()
{
	$ci =& get_instance();
	$err = do_session('get','errors');
	
	$ci->load->helper('html');
	
	$err = '<div class="errors_found">'.ul($err).'</div>';
	
	if(IS_AJAX)
	{
		jsout(false, array('errors' => $err)); 
	}else{
		return $err;
	}
}

function enkript($val)
{
    $ci =& get_instance();

    return $ci->encrypt->encode($val);
}

function dekript($val)
{
    $ci =& get_instance();

    return $ci->encrypt->decode($val);
}

function phpdbnow()
{
	$now = getdate();
	return $now['year'].'-'.$now['mon'].'-'.$now['mday'].' '.$now['hours'].':'.$now['minutes'].':'.$now['seconds'];
}

function ordinal(num) {
	return num + (
		(num % 10 == 1 && num % 100 != 11) ? 'st' :
		(num % 10 == 2 && num % 100 != 12) ? 'nd' :
		(num % 10 == 3 && num % 100 != 13) ? 'rd' : 'th'
	);
}

function setKeyVal($data,$value)
{
	$tmp = false;
	if($data && count($data))
	{
		foreach($data as $key=>$val){
			$tmp[$val['id']] = $val[$value];	
		}
	}
	return $tmp;
}

function randomstring($length = 10) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $characters[rand(0, strlen($characters) - 1)];
    }
    return $randomString;
}

function time_elapsed_string($datetime, $full = false) {
    $now = new DateTime;
    $ago = new DateTime($datetime);
    $diff = $now->diff($ago);

    $diff->w = floor($diff->d / 7);
    $diff->d -= $diff->w * 7;

    $string = array(
        'y' => 'tahun',
        'm' => 'bulan',
        'w' => 'minggu',
        'd' => 'hari',
        'h' => 'jam',
        'i' => 'menit',
        's' => 'detik',
    );
    foreach ($string as $k => &$v) {
        if ($diff->$k) {
           // $v = $diff->$k . ' ' . $v . ($diff->$k > 1 ? 's' : '');
		   $v = $diff->$k . ' ' . $v;
        } else {
            unset($string[$k]);
        }
    }

    if (!$full) $string = array_slice($string, 0, 1);
    return $string ? implode(', ', $string) . ' yang lalu' : 'baru saja';
}