+/*
+ * This function can be used to replace non-braking space symbols
+ * that are inserted in forms by some browsers instead of normal
+ * space symbol.
+ */
+function cleanup_nbsp($string,$charset) {
+
+ // reduce number of case statements
+ if (stristr('iso-8859-',substr($charset,0,9))){
+ $output_charset="iso-8859-x";
+ }
+ if (stristr('windows-125',substr($charset,0,11))){
+ $output_charset="cp125x";
+ }
+ if (stristr('koi8',substr($charset,0,4))){
+ $output_charset="koi8-x";
+ }
+ if (! isset($output_charset)){
+ $output_charset=strtolower($charset);
+ }
+
+// where is non-braking space symbol
+switch($output_charset):
+ case "iso-8859-x":
+ case "cp125x":
+ case "iso-2022-jp":
+ $nbsp="\xA0";
+ break;
+ case "koi8-x":
+ $nbsp="\x9A";
+ break;
+ case "utf-8":
+ $nbsp="\xC2\xA0";
+ break;
+ default:
+ // don't change string if charset is unmatched
+ return $string;
+endswitch;
+
+// return space instead of non-braking space.
+ return str_replace($nbsp,' ',$string);
+}
+
+function is_conversion_safe($input_charset) {
+ global $languages, $sm_notAlias, $default_charset;
+
+ // convert to lower case
+ $input_charset = strtolower($input_charset);
+
+ // Is user's locale Unicode based ?
+ if ( $default_charset == "utf-8" ) {
+ return true;
+ }
+
+ // Charsets that are similar
+switch ($default_charset):
+case "windows-1251":
+ if ( $input_charset == "iso-8859-5" ||
+ $input_charset == "koi8-r" ||
+ $input_charset == "koi8-u" ) {
+ return true;
+ } else {
+ return false;
+ }
+case "windows-1257":
+ if ( $input_charset == "iso-8859-13" ||
+ $input_charset == "iso-8859-4" ) {
+ return true;
+ } else {
+ return false;
+ }
+case "iso-8859-4":
+ if ( $input_charset == "iso-8859-13" ||
+ $input_charset == "windows-1257" ) {
+ return true;
+ } else {
+ return false;
+ }
+case "iso-8859-5":
+ if ( $input_charset == "windows-1251" ||
+ $input_charset == "koi8-r" ||
+ $input_charset == "koi8-u" ) {
+ return true;
+ } else {
+ return false;
+ }
+case "iso-8859-13":
+ if ( $input_charset == "iso-8859-4" ||
+ $input_charset == "windows-1257" ) {
+ return true;
+ } else {
+ return false;
+ }
+case "koi8-r":
+ if ( $input_charset == "windows-1251" ||
+ $input_charset == "iso-8859-5" ||
+ $input_charset == "koi8-u" ) {
+ return true;
+ } else {
+ return false;
+ }
+case "koi8-u":
+ if ( $input_charset == "windows-1251" ||
+ $input_charset == "iso-8859-5" ||
+ $input_charset == "koi8-r" ) {
+ return true;
+ } else {
+ return false;
+ }
+default:
+ return false;
+endswitch;
+}
+?>