+ $digitGroupingPattern = $this->digitGroupingPattern();
+
+ if ( !$digitGroupingPattern || $digitGroupingPattern === "###,###,###" ) {
+ //default grouping is at thousands, use the same for ###,###,### pattern too.
+ return strrev( (string)preg_replace( '/(\d{3})(?=\d)(?!\d*\.)/', '$1,', strrev( $_ ) ) );
+ }
+ else {
+ // Ref: http://cldr.unicode.org/translation/number-patterns
+ $numberpart = array();
+ $decimalpart = array();
+ $numMatches = preg_match_all( "/(#+)/", $digitGroupingPattern, $matches );
+ preg_match( "/\d+/", $_, $numberpart );
+ preg_match( "/\.\d*/", $_, $decimalpart );
+ $groupedNumber = ( count( $decimalpart ) > 0 ) ? $decimalpart[0]:"";
+ if ( $groupedNumber === $_){
+ //the string does not have any number part. Eg: .12345
+ return $groupedNumber;
+ }
+ $start = $end = strlen( $numberpart[0] );
+ while ( $start > 0 )
+ {
+ $match = $matches[0][$numMatches -1] ;
+ $matchLen = strlen( $match );
+ $start = $end - $matchLen;
+ if ( $start < 0 ) {
+ $start = 0;
+ }
+ $groupedNumber = substr( $_ , $start, $end -$start ) . $groupedNumber ;
+ $end = $start;
+ if ( $numMatches > 1 ) {
+ // use the last pattern for the rest of the number
+ $numMatches--;
+ }
+ if ( $start > 0 ) {
+ $groupedNumber = "," . $groupedNumber;
+ }
+ }
+ return $groupedNumber;
+ }
+ }
+ /**
+ * @return String
+ */
+ function digitGroupingPattern() {
+ return self::$dataCache->getItem( $this->mCode, 'digitGroupingPattern' );