functions-formatting.php

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	'‘' => '‘',
	'’' => '’',
	'“' => '“',
	'”' => '”',
	'•' => '•',
	'–' => '–',
	'—' => '—',
	'˜' => '˜',
	'™' => '™',
	'š' => 'š',
	'›' => '›',
	'œ' => 'œ',
	'' => '',
	'ž' => '',
	'Ÿ' => 'Ÿ'
	);

	// Remove metadata tags
	$content = preg_replace('/<title>(.+?)<\/title>/','',$content);
	$content = preg_replace('/<category>(.+?)<\/category>/','',$content);

	// Converts lone & characters into &#38; (a.k.a. &amp;)
	$content = preg_replace('/&([^#])(?![a-z1-4]{1,8};)/i', '&#038;$1', $content);

	// Fix Word pasting
	$content = strtr($content, $wp_htmltranswinuni);

	// Just a little XHTML help
	$content = str_replace('<br>', '<br />', $content);
	$content = str_replace('<hr>', '<hr />', $content);

	return $content;
}

function funky_javascript_fix($text) {
	// Fixes for browsers' javascript bugs
	global $is_macIE, $is_winIE;
	
	if ( $is_winIE || $is_macIE )
		$text =  preg_replace("/\%u([0-9A-F]{4,4})/e",  "'&#'.base_convert('\\1',16,10).';'", $text);
	
	return $text;
}

/*
 balanceTags
 
 Balances Tags of string using a modified stack.
 
 @param text      Text to be balanced
 @return          Returns balanced text
 @author          Leonard Lin ([e-mail])
 @version         v1.1
 @date            November 4, 2001
 @license         GPL v2.0
 @notes           
 @changelog       
 ---  Modified by Scott Reilly (coffee2code) 02 Aug 2004
             1.2  ***TODO*** Make better - change loop condition to $text
             1.1  Fixed handling of append/stack pop order of end text
                  Added Cleaning Hooks
             1.0  First Version
*/
function balanceTags($text, $is_comment = 0) {
	
	if ( get_option('use_balanceTags') == 0)
		return $text;

	$tagstack = array(); $stacksize = 0; $tagqueue = ''; $newtext = '';

	# WP bug fix for comments - in case you REALLY meant to type '< !--'
	$text = str_replace('< !--', '<    !--', $text);
	# WP bug fix for LOVE <3 (and other situations with '<' before a number)
	$text = preg_replace('#<([0-9]{1})#', '&lt;$1', $text);

	while (preg_match("/<(\/?\w*)\s*([^>]*)>/",$text,$regex)) {
		$newtext .= $tagqueue;

		$i = strpos($text,$regex[0]);
		$l = strlen($regex[0]);

		// clear the shifter
		$tagqueue = '';
		// Pop or Push
		if ($regex[1][0] == "/") { // End Tag
			$tag = strtolower(substr($regex[1],1));
			// if too many closing tags
			if($stacksize <= 0) { 
				$tag = '';
				//or close to be safe $tag = '/' . $tag;
			}
			// if stacktop value = tag close value then pop
			else if ($tagstack[$stacksize - 1] == $tag) { // found closing tag
				$tag = '</' . $tag . '>'; // Close Tag
				// Pop
				array_pop ($tagstack);
				$stacksize--;
			} else { // closing tag not at top, search for it
				for ($j=$stacksize-1;$j>=0;$j--) {
					if ($tagstack[$j] == $tag) {
					// add tag to tagqueue
						for ($k=$stacksize-1;$k>=$j;$k--){
							$tagqueue .= '</' . array_pop ($tagstack) . '>';
							$stacksize--;
						}
						break;
					}
				}
				$tag = '';
			}
		} else { // Begin Tag
			$tag = strtolower($regex[1]);

			// Tag Cleaning

			// If self-closing or '', don't do anything.
			if((substr($regex[2],-1) == '/') || ($tag == '')) {
			}
			// ElseIf it's a known single-entity tag but it doesn't close itself, do so
			elseif ($tag == 'br' || $tag == 'img' || $tag == 'hr' || $tag == 'input') {
				$regex[2] .= '/';
			} else {	// Push the tag onto the stack
				// If the top of the stack is the same as the tag we want to push, close previous tag
				if (($stacksize > 0) && ($tag != 'div') && ($tagstack[$stacksize - 1] == $tag)) {
					$tagqueue = '</' . array_pop ($tagstack) . '>';
					$stacksize--;
				}
				$stacksize = array_push ($tagstack, $tag);
			}

			// Attributes
			$attributes = $regex[2];
			if($attributes) {
				$attributes = ' '.$attributes;
			}
			$tag = '<'.$tag.$attributes.'>';
			//If already queuing a close tag, then put this tag on, too
			if ($tagqueue) {
				$tagqueue .= $tag;
				$tag = '';
			}
		}
		$newtext .= substr($text,0,$i) . $tag;
		$text = substr($text,$i+$l);
	}  

	// Clear Tag Queue
	$newtext .= $tagqueue;

	// Add Remaining text
	$newtext .= $text;

	// Empty Stack
	while($x = array_pop($tagstack)) {
		$newtext .= '</' . $x . '>'; // Add remaining tags to close
	}

	// WP fix for the bug with HTML comments
	$newtext = str_replace("< !--","<!--",$newtext);
	$newtext = str_replace("<    !--","< !--",$newtext);

	return $newtext;
}

function force_balance_tags($text) {
	return balanceTags($text, 0, true);
}

function format_to_edit($content, $richedit = false) {
	$content = apply_filters('format_to_edit', $content);
	if (! $richedit )
		$content = htmlspecialchars($content);
	return $content;
}

function format_to_post($content) {
	global $wpdb;
	$content = apply_filters('format_to_post', $content);
	return $content;
}

function zeroise($number,$threshold) { // function to add leading zeros when necessary
	return sprintf('%0'.$threshold.'s', $number);
}


function backslashit($string) {
	$string = preg_replace('/^([0-9])/', '\\\\\\\\\1', $string);
	$string = preg_replace('/([a-z])/i', '\\\\\1', $string);
	return $string;
}

function trailingslashit($string) {
    if ( '/' != substr($string, -1)) {
        $string .= '/';
    }
    return $string;
}

function addslashes_gpc($gpc) {
	global $wpdb;

	if (get_magic_quotes_gpc()) {
		$gpc = stripslashes($gpc);
	}

	return $wpdb->escape($gpc);
}


function stripslashes_deep($value)
{
   $value = is_array($value) ?
               array_map('stripslashes_deep', $value) :
               stripslashes($value);

   return $value;
}

function antispambot($emailaddy, $mailto=0) {
	$emailNOSPAMaddy = '';
	srand ((float) microtime() * 1000000);
	for ($i = 0; $i < strlen($emailaddy); $i = $i + 1) {
		$j = floor(rand(0, 1+$mailto));
		if ($j==0) {
			$emailNOSPAMaddy .= '&#'.ord(substr($emailaddy,$i,1)).';';
		} elseif ($j==1) {
			$emailNOSPAMaddy .= substr($emailaddy,$i,1);
		} elseif ($j==2) {
			$emailNOSPAMaddy .= '%'.zeroise(dechex(ord(substr($emailaddy, $i, 1))), 2);
		}
	}
	$emailNOSPAMaddy = str_replace('@','&#64;',$emailNOSPAMaddy);
	return $emailNOSPAMaddy;
}

function make_clickable($ret) {
	$ret = ' ' . $ret;
	$ret = preg_replace("#(^|[\n ])([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "$1<a href='$2' rel='nofollow'>$2</a>", $ret);
	$ret = preg_replace("#(^|[\n ])((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "$1<a href='http://$2' rel='nofollow'>$2</a>", $ret);
	$ret = preg_replace("#(\s)([a-z0-9\-_.]+)@([^,< \n\r]+)#i", "$1<a href=\"mailto:$2@$3\">$2@$3</a>", $ret);
	$ret = substr($ret, 1);
	$ret = trim($ret);
	return $ret;
}

function wp_rel_nofollow( $text ) {
	$text = preg_replace('|<a (.+?)>|i', '<a $1 rel="nofollow">', $text);
	return $text;
}

function convert_smilies($text) {
	global $wp_smiliessearch, $wp_smiliesreplace;
    $output = '';
	if (get_settings('use_smilies')) {
		// HTML loop taken from texturize function, could possible be consolidated
		$textarr = preg_split("/(<.*>)/U", $text, -1, PREG_SPLIT_DELIM_CAPTURE); // capture the tags as well as in between
		$stop = count($textarr);// loop stuff
		for ($i = 0; $i < $stop; $i++) {
			$content = $textarr[$i];
			if ((strlen($content) > 0) && ('<' != $content{0})) { // If it's not a tag
				$content = str_replace($wp_smiliessearch, $wp_smiliesreplace, $content);
			}
			$output .= $content;
		}
	} else {
		// return default text.
		$output = $text;
	}
	return $output;
}


function is_email($user_email) {
	$chars = "/^([a-z0-9+_]|\\-|\\.)+@(([a-z0-9_]|\\-)+\\.)+[a-z]{2,6}\$/i";
	if(strstr($user_email, '@') && strstr($user_email, '.')) {
		if (preg_match($chars, $user_email)) {
			return true;
		} else {
			return false;
		}
	} else {
		return false;
	}
}

// used by wp-mail to handle charsets in email subjects
function wp_iso_descrambler($string) {
  /* this may only work with iso-8859-1, I'm afraid */
  if (!preg_match('#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches)) {
    return $string;
  } else {
    $subject = str_replace('_', ' ', $matches[2]);
    $subject = preg_replace('#\=([0-9a-f]{2})#ei', "chr(hexdec(strtolower('$1')))", $subject);
    return $subject;
  }
}


// give it a date, it will give you the same date as GMT
function get_gmt_from_date($string) {
  // note: this only substracts $time_difference from the given date
  preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches);
  $string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]);
  $string_gmt = gmdate('Y-m-d H:i:s', $string_time - get_settings('gmt_offset') * 3600);
  return $string_gmt;
}

// give it a GMT date, it will give you the same date with $time_difference added
function get_date_from_gmt($string) {
  // note: this only adds $time_difference to the given date
  preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches);
  $string_time = gmmktime($matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1]);
  $string_localtime = gmdate('Y-m-d H:i:s', $string_time + get_settings('gmt_offset')*3600);
  return $string_localtime;
}

// computes an offset in seconds from an iso8601 timezone
function iso8601_timezone_to_offset($timezone) {
  // $timezone is either 'Z' or '[+|-]hhmm'
  if ($timezone == 'Z') {
    $offset = 0;
  } else {
    $sign    = (substr($timezone, 0, 1) == '+') ? 1 : -1;
    $hours   = intval(substr($timezone, 1, 2));
    $minutes = intval(substr($timezone, 3, 4)) / 60;
    $offset  = $sign * 3600 * ($hours + $minutes);
  }
  return $offset;
}

// converts an iso8601 date to MySQL DateTime format used by post_date[_gmt]
function iso8601_to_datetime($date_string, $timezone = USER) {
  if ($timezone == GMT) {
    preg_match('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', $date_string, $date_bits);
    if (!empty($date_bits[7])) { // we have a timezone, so let's compute an offset
      $offset = iso8601_timezone_to_offset($date_bits[7]);
    } else { // we don't have a timezone, so we assume user local timezone (not server's!)
      $offset = 3600 * get_settings('gmt_offset');
    }
    $timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]);
    $timestamp -= $offset;
    return gmdate('Y-m-d H:i:s', $timestamp);
  } elseif ($timezone == USER) {
    return preg_replace('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', '$1-$2-$3 $4:$5:$6', $date_string);
  }