functions.php

<?php

function clean($str) { /* sanatize strings for databases & security */
  $str = @trim($str);
	if(get_magic_quotes_gpc()) {
		$str = stripslashes($str);
	}
	return mysqli_real_escape_string($str);
}

/* turning new lines into paragraph tags */
/* USAGE: echo nl2p($string); */
function nl2p($string, $line_breaks = true, $xml = true) {
    // Remove existing HTML formatting to avoid double-wrapping things
    $string = str_replace(array('<p>', '</p>', '<br>', '<br />'), '', $string);
    
    // It is conceivable that people might still want single line-breaks
    // without breaking into a new paragraph.
    if ($line_breaks == true)
        return '<p>'.preg_replace(array("/([\n]{2,})/i", "/([^>])\n([^<])/i"), array("</p>\n<p>", '<br'.($xml == true ? ' /' : '').'>'), trim($string)).'</p>';
    else 
        return '<p>'.preg_replace("/([\n]{1,})/i", "</p>\n<p>", trim($string)).'</p>';
}

function genPassword($length = 8) { /* generate an 8-character random password/string */
    $validCharacters = "abcdefghijklmnopqrstuxyvwzABCDEFGHIJKLMNOPQRSTUXYVWZ1234567890";
    $validCharNumber = strlen($validCharacters);
 
    $result = "";
 
    for ($i = 0; $i < $length; $i++) {
        $index = mt_rand(0, $validCharNumber - 1);
        $result .= $validCharacters[$index];
    }
 
    return $result;
}

/* turns urls to hyperlinks */
/* USAGE: echo urls_to_links('http://daneden.me'); outputs <a href="http://daneden.me">http://daneden.me</a> */
function urls_to_links($str) { /* Credit for this function goes to @coleydotco */
    $pattern = '/((?:http|https)(?::\\/{2}[\\w]+)(?:[\\/|\\.]?)(?:[^\\s"]*))/is';
    $replace = '<a target="blank" href="$1">$1</a>';
    return preg_replace($pattern, $replace, $str);
}

function is_valid_email($email, $test_mx = false) { /* checks if email address is valid */
	if(eregi("^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email))
		if($test_mx)
		{
			list($username, $domain) = split("@", $email);
			return getmxrr($domain, $mxrecords);
		}
		else
			return true;
	else
		return false;
}

function show_gravatar($email, $size, $default, $rating) { /* allows use of gravatars */
	echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.md5(strtolower($email)).
		'&default='.$default.'&size='.$size.'&rating='.$rating.'" width="'.$size.'px"
		height="'.$size.'px" />';
}


/*Useful magic_quotes_gpc hack*/

if (get_magic_quotes_gpc())
{
  $process = array(&$_GET, &$_POST, &$_COOKIE, &$_REQUEST);
  while (list($key, $val) = each($process))
  {
    foreach ($val as $k => $v)
    {
      unset($process[$key][$k]);
      if (is_array($v))
      {
        $process[$key][stripslashes($k)] = $v;
        $process[] = &$process[$key][stripslashes($k)];
      }
      else
      {
        $process[$key][stripslashes($k)] = stripslashes($v);
      }
    }
  }
  unset($process);
}


?>