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<?php
/**
* Elgg Social
* Functions and objects which provide powerful social aspects within Elgg
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
/**
* Filters a string into an array of significant words
*
* @param string $string
* @return array
*/
function filter_string(string $string) {
// Convert it to lower and trim
$string = strtolower($string);
$string = trim($string);
// Remove links and email addresses
// match protocol://address/path/file.extension?some=variable&another=asf%
$string = preg_replace("/\s([a-zA-Z]+:\/\/[a-z][a-z0-9\_\.\-]*[a-z]{2,6}[a-zA-Z0-9\/\*\-\?\&\%\=]*)([\s|\.|\,])/iu"," ", $string);
// match www.something.domain/path/file.extension?some=variable&another=asf%
$string = preg_replace("/\s(www\.[a-z][a-z0-9\_\.\-]*[a-z]{2,6}[a-zA-Z0-9\/\*\-\?\&\%\=]*)([\s|\.|\,])/iu"," ", $string);
// match name@address
$string = preg_replace("/\s([a-zA-Z][a-zA-Z0-9\_\.\-]*[a-zA-Z]*\@[a-zA-Z][a-zA-Z0-9\_\.\-]*[a-zA-Z]{2,6})([\s|\.|\,])/iu"," ", $string);
// Sanitise the string; remove unwanted characters
$string = preg_replace('/\W/ui', ' ', $string);
// Explode it into an array
$terms = explode(' ',$string);
// Remove any blacklist terms
$terms = array_filter($terms, 'remove_blacklist');
return $terms;
}
/**
* Returns true if the word in $input is considered significant
*
* @param string $input
* @return true|false
*/
function remove_blacklist($input) {
global $CONFIG;
if (strlen($input) < 3 || in_array($input,$CONFIG->wordblacklist))
return false;
return true;
}
// Set the shout words blacklist, these do not become tags when the string is converted
// Any language packs should include their own!
function social_init() {
global $CONFIG;
$CONFIG->wordblacklist = array(
'and',
'the',
'then',
'but',
'she',
'his',
'her',
'him',
'one',
'not',
'also',
'about',
'now',
'hence',
'however',
'still',
'likewise',
'otherwise',
'therefore',
'conversely',
'rather',
'consequently',
'furthermore',
'nevertheless',
'instead',
'meanwhile',
'accordingly',
'this',
'seems',
'what',
'whom',
'whose',
'whoever',
'whomever',
);
}
register_elgg_event_handler("init","system","social_init");
?>
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