Changeset 442

Timestamp:

08/29/2007 10:30:18 AM (15 months ago)

Author:

Geert

Message:

text::censor() added

I started from CI's word_censor() helper, but had to improve it a lot:

• You can now pass a string as 2nd argument, the function will wrap it into an array automatically.
  
• If your replacement is a single character (any character) the badword will be fully masked with it, only possible with '#' in CI.
  
• Bugfix: badwords that contain word boundaries themselves didn't get replaced
  
• Added support for partial replacements (so f*cking becomes ####ing when searching for f*ck). Trigger it by the 4th parameter.
  
• UTF-8 compatible
  

Files:

• trunk/system/helpers/text.php (modified) (2 diffs)

trunk/system/helpers/text.php

@@ -97 +97 @@
         public static function random($type = 'alnum', $length = 8)
         {
-                if ($type == 'unique')
-                        return md5(uniqid(mt_rand()));
-
                 switch ($type)
                 {
+                        case 'unique':
+                                return md5(uniqid(mt_rand()));
                         case '':
                         case 'alnum':
@@ -130 +129 @@
                 return $str;
         }
+        
+        /**
+         * Word censor
+         *
+         * @access      public
+         * @param       string
+         * @param       mixed
+         * @param       string
+         * @param       boolean
+         * @return      string
+         */
+        public static function censor($str, $badwords, $replacement = '#', $replace_partial_words = FALSE)
+        {
+                if ( ! is_array($badwords))
+                {
+                        $badwords = (array) $badwords;
+                }
+
+                foreach ($badwords as $key => $badword)
+                {
+                        $badwords[$key] = str_replace('\*', '\S*?', preg_quote((string) $badword));
+                }
+
+                $regex = '('.implode('|', $badwords).')';
+
+                if ( ! $replace_partial_words)
+                {
+                        // Just using \b isn't sufficient when we need to replace a badword that already contains word boundaries itself
+                        $regex = '(?<=\b|\s|^)'.$regex.'(?=\b|\s|$)';
+                }
+
+                $regex = '!'.$regex.'!ui';
+
+                if (utf8::strlen($replacement) == 1)
+                {
+                        $regex .= 'e';
+                        return preg_replace($regex, 'str_repeat($replacement, utf8::strlen(\'$1\'))', $str);
+                }
+
+                return preg_replace($regex, $replacement, $str);
+        }
 
 } // End text class