replace)
// returns substituted string.
// WARNING: this is pretty basic, and doesn't properly handle search strings that are substrings of each other.
// For instance if 'test' => "foo" and 'testing' => "bar", testing could become either bar or fooing, 
// depending on the order in which they were declared in the array.   
require_once("include/template_processor.php");
if(! function_exists('replace_macros')) {  
function replace_macros($s,$r) {
	global $t;
	
	//$ts = microtime();
	$r =  $t->replace($s,$r);
	//$tt = microtime() - $ts;
	
	//$a = get_app();
	//$a->page['debug'] .= "$tt 
'."\r\n";
	}
	return $o;
}}
if(! function_exists('alt_pager')) {
function alt_pager(&$a, $i) {
        $o = '';
	$stripped = preg_replace('/(&page=[0-9]*)/','',$a->query_string);
	$stripped = str_replace('q=','',$stripped);
	$stripped = trim($stripped,'/');
	$pagenum = $a->pager['page'];
        $url = $a->get_baseurl() . '/' . $stripped;
        $o .= ''."\r\n";
	return $o;
}}
// Turn user/group ACLs stored as angle bracketed text into arrays
if(! function_exists('expand_acl')) {
function expand_acl($s) {
	// turn string array of angle-bracketed elements into string array
	// e.g. "<123xyz><246qyo>" => array(123xyz,246qyo,sxo33e);
	$ret = array();
	if(strlen($s)) {
		$t = str_replace('<','',$s);
		$a = explode('>',$t);
		foreach($a as $aa) {
			if($aa)
				$ret[] = $aa;
		}
	}
	return $ret;
}}		
// Used to wrap ACL elements in angle brackets for storage 
if(! function_exists('sanitise_acl')) {
function sanitise_acl(&$item) {
	if(intval($item))
		$item = '<' . notags(trim($item)) . '>';
	else
		unset($item);
}}
// Convert an ACL array to a storable string
if(! function_exists('perms2str')) {
function perms2str($p) {
	$ret = '';
	if(is_array($p))
		$tmp = $p;
	else
		$tmp = explode(',',$p);
	if(is_array($tmp)) {
		array_walk($tmp,'sanitise_acl');
		$ret = implode('',$tmp);
	}
	return $ret;
}}
// generate a guaranteed unique (for this domain) item ID for ATOM
// safe from birthday paradox
if(! function_exists('item_message_id')) {
function item_message_id() {
	do {
		$dups = false;
		$hash = random_string();
		$uri = $hash . '@' . get_app()->get_hostname();
		$r = q("SELECT `id` FROM `item` WHERE `uri` = '%s' LIMIT 1",
			dbesc($uri));
		if(count($r))
			$dups = true;
	} while($dups == true);
	return $uri;
}}
// Generate a guaranteed unique photo ID.
// safe from birthday paradox
if(! function_exists('photo_new_resource')) {
function photo_new_resource() {
	do {
		$found = false;
		$resource = hash('md5',uniqid(mt_rand(),true));
		$r = q("SELECT `id` FROM `photo` WHERE `resource_id` = '%s' LIMIT 1",
			dbesc($resource)
		);
		if(count($r))
			$found = true;
	} while($found == true);
	return $resource;
}}
// for html,xml parsing - let's say you've got
// an attribute foobar="class1 class2 class3"
// and you want to find out if it contains 'class3'.
// you can't use a normal sub string search because you
// might match 'notclass3' and a regex to do the job is 
// possible but a bit complicated. 
// pass the attribute string as $attr and the attribute you 
// are looking for as $s - returns true if found, otherwise false
if(! function_exists('attribute_contains')) {
function attribute_contains($attr,$s) {
	$a = explode(' ', $attr);
	if(count($a) && in_array($s,$a))
		return true;
	return false;
}}
if(! function_exists('logger')) {
function logger($msg,$level = 0) {
	// turn off logger in install mode
	global $a;
	global $db;
	if(($a->module == 'install') || (! ($db && $db->connected))) return;
	$debugging = get_config('system','debugging');
	$loglevel  = intval(get_config('system','loglevel'));
	$logfile   = get_config('system','logfile');
	if((! $debugging) || (! $logfile) || ($level > $loglevel))
		return;
	
	@file_put_contents($logfile, datetime_convert() . ':' . session_id() . ' ' . $msg . "\n", FILE_APPEND);
	return;
}}
if(! function_exists('activity_match')) {
function activity_match($haystack,$needle) {
	if(($haystack === $needle) || ((basename($needle) === $haystack) && strstr($needle,NAMESPACE_ACTIVITY_SCHEMA)))
		return true;
	return false;
}}
// Pull out all #hashtags and @person tags from $s;
// We also get @person@domain.com - which would make 
// the regex quite complicated as tags can also
// end a sentence. So we'll run through our results
// and strip the period from any tags which end with one.
// Returns array of tags found, or empty array.
if(! function_exists('get_tags')) {
function get_tags($s) {
	$ret = array();
	// ignore anything in a code block
	$s = preg_replace('/\[code\](.*?)\[\/code\]/sm','',$s);
	// Match full names against @tags including the space between first and last
	// We will look these up afterward to see if they are full names or not recognisable.
	if(preg_match_all('/(@[^ \x0D\x0A,:?]+ [^ \x0D\x0A@,:?]+)([ \x0D\x0A@,:?]|$)/',$s,$match)) {
		foreach($match[1] as $mtch) {
			if(strstr($mtch,"]")) {
				// we might be inside a bbcode color tag - leave it alone
				continue;
			}
			if(substr($mtch,-1,1) === '.')
				$ret[] = substr($mtch,0,-1);
			else
				$ret[] = $mtch;
		}
	}
	// Otherwise pull out single word tags. These can be @nickname, @first_last
	// and #hash tags.
	if(preg_match_all('/([@#][^ \x0D\x0A,;:?]+)([ \x0D\x0A,;:?]|$)/',$s,$match)) {
		foreach($match[1] as $mtch) {
			if(strstr($mtch,"]")) {
				// we might be inside a bbcode color tag - leave it alone
				continue;
			}
			if(substr($mtch,-1,1) === '.')
				$mtch = substr($mtch,0,-1);
			// ignore strictly numeric tags like #1
			if((strpos($mtch,'#') === 0) && ctype_digit(substr($mtch,1)))
				continue;
			// try not to catch url fragments
			if(strpos($s,$mtch) && preg_match('/[a-zA-z0-9\/]/',substr($s,strpos($s,$mtch)-1,1)))
				continue;
			$ret[] = $mtch;
		}
	}
	return $ret;
}}
// quick and dirty quoted_printable encoding
if(! function_exists('qp')) {
function qp($s) {
return str_replace ("%","=",rawurlencode($s));
}} 
if(! function_exists('get_mentions')) {
function get_mentions($item,$tags) {
	$o = '';
	if(! count($tags))
		return $o;
	foreach($tags as $x) {
		if($x['type'] == TERM_MENTION) {
			$o .= "\t\t" . '';
	$o .= '
';
	return $o;
}}
if(! function_exists('valid_email')) {
function valid_email($x){
	if(get_config('system','disable_email_validation'))
		return true;
	if(preg_match('/^[_a-zA-Z0-9\-\+]+(\.[_a-zA-Z0-9\-\+]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)+$/',$x))
		return true;
	return false;
}}
/**
 *
 * Function: linkify
 *
 * Replace naked text hyperlink with HTML formatted hyperlink
 *
 */
if(! function_exists('linkify')) {
function linkify($s) {
	$s = preg_replace("/(https?\:\/\/[a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\'\%\$\!\+]*)/", ' $1 ', $s);
	$s = preg_replace("/\<(.*?)(src|href)=(.*?)\&\;(.*?)\>/ism",'<$1$2=$3&$4>',$s);
	return($s);
}}
function get_poke_verbs() {
	
	// index is present tense verb
	// value is array containing past tense verb, translation of present, translation of past
	$arr = array(
		'poke' => array( 'poked', t('poke'), t('poked')),
		'ping' => array( 'pinged', t('ping'), t('pinged')),
		'prod' => array( 'prodded', t('prod'), t('prodded')),
		'slap' => array( 'slapped', t('slap'), t('slapped')),
		'finger' => array( 'fingered', t('finger'), t('fingered')),
		'rebuff' => array( 'rebuffed', t('rebuff'), t('rebuffed')),
	);
	call_hooks('poke_verbs', $arr);
	return $arr;
}
function get_mood_verbs() {
	
	// index is present tense verb
	// value is array containing past tense verb, translation of present, translation of past
	$arr = array(
		'happy'      => t('happy'),
		'sad'        => t('sad'),
		'mellow'     => t('mellow'),
		'tired'      => t('tired'),
		'perky'      => t('perky'),
		'angry'      => t('angry'),
		'stupefied'  => t('stupified'),
		'puzzled'    => t('puzzled'),
		'interested' => t('interested'),
		'bitter'     => t('bitter'),
		'cheerful'   => t('cheerful'),
		'alive'      => t('alive'),
		'annoyed'    => t('annoyed'),
		'anxious'    => t('anxious'),
		'cranky'     => t('cranky'),
		'disturbed'  => t('disturbed'),
		'frustrated' => t('frustrated'),
		'motivated'  => t('motivated'),
		'relaxed'    => t('relaxed'),
		'surprised'  => t('surprised'),
	);
	call_hooks('mood_verbs', $arr);
	return $arr;
}
/**
 * 
 * Function: smilies
 *
 * Description:
 * Replaces text emoticons with graphical images
 *
 * @Parameter: string $s
 *
 * Returns string
 *
 * It is expected that this function will be called using HTML text.
 * We will escape text between HTML pre and code blocks from being 
 * processed. 
 * 
 * At a higher level, the bbcode [nosmile] tag can be used to prevent this 
 * function from being executed by the prepare_text() routine when preparing
 * bbcode source for HTML display
 *
 */
if(! function_exists('smilies')) {
function smilies($s, $sample = false) {
	$a = get_app();
	if(intval(get_config('system','no_smilies')) 
		|| (local_user() && intval(get_pconfig(local_user(),'system','no_smilies'))))
		return $s;
	$s = preg_replace_callback('/(.*?)<\/pre>/ism','smile_encode',$s);
	$s = preg_replace_callback('/(.*?)<\/code>/ism','smile_encode',$s);
	$texts =  array( 
		'<3', 
		'</3', 
		'<\\3', 
		':-)', 
		';-)', 
		':-(', 
		':-P', 
		':-p', 
		':-"', 
		':-"', 
		':-x', 
		':-X', 
		':-D', 
		'8-|', 
		'8-O', 
		':-O', 
		'\\o/', 
		'o.O', 
		'O.o', 
		'o_O', 
		'O_o', 
		":'(", 
		":-!", 
		":-/", 
		":-[", 
		"8-)",
		':beer', 
		':homebrew', 
		':coffee', 
		':facepalm',
		':like',
		':dislike',
		'~friendika', 
		'~friendica'
	);
	$icons = array(
		'~friendika  ',
		'~friendica  '
	);
	$params = array('texts' => $texts, 'icons' => $icons, 'string' => $s);
	call_hooks('smilie', $params);
	if($sample) {
		$s = '';
		for($x = 0; $x < count($params['texts']); $x ++) {
			$s .= '
' . $params['texts'][$x] . ' ' . $params['icons'][$x] . ' ';
		}
	}
	else {
		$params['string'] = preg_replace_callback('/<(3+)/','preg_heart',$params['string']);
		$s = str_replace($params['texts'],$params['icons'],$params['string']);
	}
	$s = preg_replace_callback('/
(.*?)<\/pre>/ism','smile_decode',$s);
	$s = preg_replace_callback('/(.*?)<\/code>/ism','smile_decode',$s);
	return $s;
}}
function smile_encode($m) {
	return(str_replace($m[1],base64url_encode($m[1]),$m[0]));
}
function smile_decode($m) {
	return(str_replace($m[1],base64url_decode($m[1]),$m[0]));
}
// expand <3333 to the correct number of hearts
function preg_heart($x) {
	$a = get_app();
	if(strlen($x[1]) == 1)
		return $x[0];
	$t = '';
	for($cnt = 0; $cnt < strlen($x[1]); $cnt ++)
		$t .= '';
		foreach($arr as $r) {
			$matches = false;
			$icon = '';
			$cnt = preg_match_all('|\[attach\]href=\"(.*?)\" length=\"(.*?)\" type=\"(.*?)\" title=\"(.*?)\"\[\/attach\]|',$r,$matches, PREG_SET_ORDER);
			if($cnt) {
				foreach($matches as $mtch) {
					$icontype = strtolower(substr($mtch[3],0,strpos($mtch[3],'/')));
					switch($icontype) {
						case 'video':
						case 'audio':
						case 'image':
						case 'text':
							$icon = '
';
							break;
						default:
							$icon = '
';
							break;
					}
					$title = ((strlen(trim($mtch[4]))) ? escape_tags(trim($mtch[4])) : escape_tags($mtch[1]));
					$title .= ' ' . $mtch[2] . ' ' . t('bytes');
					if((local_user() == $item['uid']) && ($item['contact-id'] != $a->contact['id']) && ($item['network'] == NETWORK_DFRN))
						$the_url = $a->get_baseurl() . '/redir/' . $item['contact-id'] . '?f=1&url=' . $mtch[1];
					else
						$the_url = $mtch[1];
					$s .= '
' . $icon . ' ';
				}
			}
		}
		$s .= '
' . t('[remove]') . ' ' : '');
		}
		if(strlen($x))
			$s .= '' . t('Categories:') . '  ' . $x . '
'; 
	}
	$x = '';
	$terms = get_terms_oftype($item['term'],TERM_FILE);
	if($terms) {
		foreach($terms as $t) {
			if(strlen($x))
				$x .= '   ';
			$x .= htmlspecialchars($t['term'],ENT_QUOTES,'UTF-8') 
				. ' ' . t('[remove]') . ' ';
		}
		if(strlen($x) && (local_user() == $item['uid']))
			$s .= '' . t('Filed under:') . '  ' . $x . '
'; 
	}
	// Look for spoiler
	$spoilersearch = '';
	// Remove line breaks before the spoiler
	while ((strpos($s, "\n".$spoilersearch) !== false))
		$s = str_replace("\n".$spoilersearch, $spoilersearch, $s);
	while ((strpos($s, "'.sprintf(t('Click to open/close')).' '.
	                                '';
		$s = substr($s, 0, $pos).$spoilerreplace.substr($s, $pos+strlen($spoilersearch));
	}
	// Look for quote with author
	$authorsearch = '';
	while ((strpos($s, $authorsearch) !== false)) {
		$pos = strpos($s, $authorsearch);
		$rnd = random_string(8);
		$authorreplace = ''.sprintf(t('Click to open/close')).' '.
	                                '';
		$s = substr($s, 0, $pos).$authorreplace.substr($s, $pos+strlen($authorsearch));
	}
	$prep_arr = array('item' => $item, 'html' => $s);
	call_hooks('prepare_body_final', $prep_arr);
	return $prep_arr['html'];
}}
// Given a text string, convert from bbcode to html and add smilie icons.
if(! function_exists('prepare_text')) {
function prepare_text($text) {
	require_once('include/bbcode.php');
	if(stristr($text,'[nosmile]'))
		$s = bbcode($text);
	else
		$s = smilies(bbcode($text));
	return $s;
}}
/**
 * return atom link elements for all of our hubs
 */
if(! function_exists('feed_hublinks')) {
function feed_hublinks() {
	$hub = get_config('system','huburl');
	$hubxml = '';
	if(strlen($hub)) {
		$hubs = explode(',', $hub);
		if(count($hubs)) {
			foreach($hubs as $h) {
				$h = trim($h);
				if(! strlen($h))
					continue;
				$hubxml .= '
';
}
function bb_translate_video($s) {
	$matches = null;
	$r = preg_match_all("/\[video\](.*?)\[\/video\]/ism",$s,$matches,PREG_SET_ORDER);
	if($r) {
		foreach($matches as $mtch) {
			if((stristr($mtch[1],'youtube')) || (stristr($mtch[1],'youtu.be')))
				$s = str_replace($mtch[0],'[youtube]' . $mtch[1] . '[/youtube]',$s);
			elseif(stristr($mtch[1],'vimeo'))
				$s = str_replace($mtch[0],'[vimeo]' . $mtch[1] . '[/vimeo]',$s);
		}
	}
	return $s;	
}
function html2bb_video($s) {
	$s = preg_replace('#]+>(.*?)https?://www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+)(.*?) #ism',
			'[youtube]$2[/youtube]', $s);
	$s = preg_replace('##ism',
			'[youtube]$2[/youtube]', $s);
	$s = preg_replace('##ism',
			'[vimeo]$2[/vimeo]', $s);
	return $s;
}
/**
 * apply xmlify() to all values of array $val, recursively
 */
function array_xmlify($val){
	if (is_bool($val)) return $val?"true":"false";
	if (is_array($val)) return array_map('array_xmlify', $val);
	return xmlify((string) $val);
}
function reltoabs($text, $base)
{
  if (empty($base))
    return $text;
  $base = rtrim($base,'/');
  $base2 = $base . "/";
 	
  // Replace links
  $pattern = "/]*) href=\"(?!http|https|\/)([^\"]*)\"/";
  $replace = " ]*) href=\"(?!http|https)([^\"]*)\"/";
  $replace = " ]*) src=\"(?!http|https|\/)([^\"]*)\"/";
  $replace = " or [music][video]
function file_tag_list_to_file($list,$type = 'file') {
        $tag_list = '';
        if(strlen($list)) {
                $list_array = explode(",",$list);
                if($type == 'file') {
	                $lbracket = '[';
	                $rbracket = ']';
	        }
                else {
	                $lbracket = '<';
        	        $rbracket = '>';
	        }
                foreach($list_array as $item) {
		  if(strlen($item)) {
		                $tag_list .= $lbracket . file_tag_encode(trim($item))  . $rbracket;
			}
                }
	}
        return $tag_list;
}
// ex. given [friends], return music,video or friends
function file_tag_file_to_list($file,$type = 'file') {
        $matches = false;
        $list = '';
        if($type == 'file') {
                $cnt = preg_match_all('/\[(.*?)\]/',$file,$matches,PREG_SET_ORDER);
	}
        else {
                $cnt = preg_match_all('/<(.*?)>/',$file,$matches,PREG_SET_ORDER);
	}
	if($cnt) {
		foreach($matches as $mtch) {
			if(strlen($list))
				$list .= ',';
			$list .= file_tag_decode($mtch[1]);
		}
	}
        return $list;
}
function file_tag_update_pconfig($uid,$file_old,$file_new,$type = 'file') {
        // $file_old - categories previously associated with an item
        // $file_new - new list of categories for an item
	if(! intval($uid))
		return false;
        if($file_old == $file_new)
	        return true;
	$saved = get_pconfig($uid,'system','filetags');
        if(strlen($saved)) {
                if($type == 'file') {
	                $lbracket = '[';
	                $rbracket = ']';
	        }
                else {
	                $lbracket = '<';
        	        $rbracket = '>';
	        }
                $filetags_updated = $saved;
		// check for new tags to be added as filetags in pconfig
                $new_tags = array();
                $check_new_tags = explode(",",file_tag_file_to_list($file_new,$type));
	        foreach($check_new_tags as $tag) {
		        if(! stristr($saved,$lbracket . file_tag_encode($tag) . $rbracket))
			        $new_tags[] = $tag;
	        }
		$filetags_updated .= file_tag_list_to_file(implode(",",$new_tags),$type);
		// check for deleted tags to be removed from filetags in pconfig
                $deleted_tags = array();
                $check_deleted_tags = explode(",",file_tag_file_to_list($file_old,$type));
	        foreach($check_deleted_tags as $tag) {
		        if(! stristr($file_new,$lbracket . file_tag_encode($tag) . $rbracket))
		                $deleted_tags[] = $tag;
	        }
                foreach($deleted_tags as $key => $tag) {
		        $r = q("select file from item where uid = %d " . file_tag_file_query('item',$tag,$type),
		                intval($uid)
	                );
	                if(count($r)) {
			        unset($deleted_tags[$key]);
	                }
			else {
			        $filetags_updated = str_replace($lbracket . file_tag_encode($tag) . $rbracket,'',$filetags_updated);
			}
		}
                if($saved != $filetags_updated) {
		        set_pconfig($uid,'system','filetags', $filetags_updated);
                }
		return true;
	}
        else
                if(strlen($file_new)) {
		        set_pconfig($uid,'system','filetags', $file_new);
                }
		return true;
}
function store_item_tag($uid,$iid,$otype,$type,$term,$url = '') {
	if(! $term) 
		return false;
	$r = q("select * from term 
		where uid = %d and oid = %d and otype = %d and type = %d 
		and term = '%s' and url = '%s' ",
		intval($uid),
		intval($iid),
		intval($otype),
		intval($type),
		dbesc($term),
		dbesc($url)
	);
	if(count($r))
		return false;
	$r = q("insert into term (uid, oid, otype, type, term, url)
		values( %d, %d, %d, %d, '%s', '%s') ",
		intval($uid),
		intval($iid),
		intval($otype),
		intval($type),
		dbesc($term),
		dbesc($url)
	);
	return $r;
}
		
function get_terms_oftype($arr,$type) {
	$ret = array();
	if(! (is_array($arr) && count($arr)))
		return $ret;
	if(! is_array($type))
		$type = array($type);
	foreach($type as $t)
		foreach($arr as $x)
			if($x['type'] == $t)
				$ret[] = $x;
	return $ret;
}
function format_term_for_display($term) {
	$s = '';
	if($term['type'] == TERM_HASHTAG)
		$s .= '#';
	elseif($term['type'] == TERM_MENTION)
		$s .= '@';
	if($term['url']) $s .= '' . htmlspecialchars($term['term']) . ' ';
	else $s .= htmlspecialchars($term['term']);
	return $s;
}
function file_tag_save_file($uid,$item,$file) {
	$result = false;
	if(! intval($uid))
		return false;
	$r = q("select file from item where id = %d and uid = %d limit 1",
		intval($item),
		intval($uid)
	);
	if(count($r)) {
		if(! stristr($r[0]['file'],'[' . file_tag_encode($file) . ']'))
			q("update item set file = '%s' where id = %d and uid = %d limit 1",
				dbesc($r[0]['file'] . '[' . file_tag_encode($file) . ']'),
				intval($item),
				intval($uid)
			);
		$saved = get_pconfig($uid,'system','filetags');
		if((! strlen($saved)) || (! stristr($saved,'[' . file_tag_encode($file) . ']')))
			set_pconfig($uid,'system','filetags',$saved . '[' . file_tag_encode($file) . ']');
		info( t('Item filed') );
	}
	return true;
}
function file_tag_unsave_file($uid,$item,$file,$cat = false) {
	$result = false;
	if(! intval($uid))
		return false;
	if($cat == true)
		$pattern = '<' . file_tag_encode($file) . '>' ;
	else
		$pattern = '[' . file_tag_encode($file) . ']' ;
	$r = q("select file from item where id = %d and uid = %d limit 1",
		intval($item),
		intval($uid)
	);
	if(! count($r))
		return false;
	q("update item set file = '%s' where id = %d and uid = %d limit 1",
		dbesc(str_replace($pattern,'',$r[0]['file'])),
		intval($item),
		intval($uid)
	);
	$r = q("select file from item where uid = %d and deleted = 0 " . file_tag_file_query('item',$file,(($cat) ? 'category' : 'file')),
		intval($uid)
	);
	if(! count($r)) {
		$saved = get_pconfig($uid,'system','filetags');
		set_pconfig($uid,'system','filetags',str_replace($pattern,'',$saved));
	}
	return true;
}
function normalise_openid($s) {
	return trim(str_replace(array('http://','https://'),array('',''),$s),'/');
}
function undo_post_tagging($s) {
	$matches = null;
	$cnt = preg_match_all('/([@#])\[url=(.*?)\](.*?)\[\/url\]/ism',$s,$matches,PREG_SET_ORDER);
	if($cnt) {
		foreach($matches as $mtch) {
			$s = str_replace($mtch[0], $mtch[1] . $mtch[3],$s);
		}
	}
	return $s;
}
function fix_mce_lf($s) {
	$s = str_replace("\r\n","\n",$s);
//	$s = str_replace("\n\n","\n",$s);
	return $s;
}
function protect_sprintf($s) {
	return(str_replace('%','%%',$s));
}
function is_a_date_arg($s) {
	$i = intval($s);
	if($i > 1900) {
		$y = date('Y');
		if($i <= $y+1 && strpos($s,'-') == 4) {
			$m = intval(substr($s,5));
			if($m > 0 && $m <= 12)
				return true;
		}
	}
	return false;
}
function legal_webbie($s) {
	if(! strlen($s))
		return '';
	$x = $s;
	do {
		$s = $x;
		$x = preg_replace('/^([^a-z])(.*?)/',"$2",$s);
	} while($x != $s);
	return preg_replace('/([^a-z0-9\-\_])/','',$x);
}
function check_webbie($arr) {
	$str = '';
	$taken = array();
	if(count($arr)) {
		foreach($arr as $x) {
			$y = legal_webbie($x);
			if(strlen($y)) {
				if($str)
					$str .= ',';
				$str .= "'" . dbesc($y) . "'";
			}
		}
		if(strlen($str)) {
			$r = q("select channel_address from channel where channel_address in ( $str ) ");
			if(count($r)) {
				foreach($r as $rr) {
					$taken[] = $rr['channel_address'];
				}
			}
			foreach($arr as $x) {
				if(! in_array($x,$taken)) {
					return $x;
				}
			}
		}
	}
	return '';
}
	
function ids_to_querystr($arr,$idx = 'id') {
	$t = array();
	foreach($arr as $x)
		$t[] = $x[$idx];
	return(implode(',', $t));
}
function xchan_query(&$items) {
	$arr = array();
	if($items && count($items)) {
		foreach($items as $item) {
			if($item['owner_xchan'] && (! in_array($item['owner_xchan'],$arr)))
				$arr[] = "'" . dbesc($item['owner_xchan']) . "'";
			if($item['author_xchan'] && (! in_array($item['author_xchan'],$arr)))
				$arr[] = "'" . dbesc($item['author_xchan']) . "'";
		}
	}
	if(count($arr)) {
		$chans = q("select xchan.*,hubloc.* from xchan left join hubloc on hubloc_hash = xchan_hash
			where xchan_hash in (" . implode(',', $arr) . ") and ( hubloc_flags & " . intval(HUBLOC_FLAGS_PRIMARY) . " )");
	}
	if($items && count($items) && $chans && count($chans)) {
		for($x = 0; $x < count($items); $x ++) {
			$items[$x]['owner'] = find_xchan_in_array($items[$x]['owner_xchan'],$chans);
			$items[$x]['author'] = find_xchan_in_array($items[$x]['author_xchan'],$chans);
		}
	}
}
function find_xchan_in_array($xchan,$arr) {
	if(count($arr)) {
		foreach($arr as $x) {
			if($x['xchan_hash'] === $xchan) {
				return $x;
			}
		}
	}
	return array();
}
function get_rel_link($j,$rel) {
	if(count($j))
		foreach($j as $l)
			if($l['rel'] === $rel)
				return $l['href'];
	return '';
}
// Lots of code to write here
function magic_link($s) {
	return $s;
}
	
function stringify_array_elms(&$arr) {
	for($x = 0; $x < count($arr); $x ++)
		$arr[$x] = "'" . $arr[$x] . "'";
}