public function commafy( $_ ) {
		if ( !preg_match( '/^\d{1,4}$/', $_ ) ) {
			return strrev( (string)preg_replace( '/(\d{3})(?=\d)(?!\d*\.)/', '$1,', strrev( $_ ) ) );
		} else {
			return $_;
		}
	}
public function commafy( $_ ) {
		if ( !preg_match( '/^\d{1,4}$/', $_ ) ) {
			return strrev( (string)preg_replace( '/(\d{3})(?=\d)(?!\d*\.)/', '$1,', strrev( $_ ) ) );
		} else {
			return $_;
		}
	}
public function commafy ( $ _ ) { if ( ! preg_match ( '/^\d{1,4}$/' , $ _ ) ) { return strrev ( ( string ) preg_replace ( '/(\d{3})(?=\d)(?!\d*\.)/' , '$1,' , strrev ( $ _ ) ) ) ; } else { return $ _ ; } }
Avoid grouping whole numbers between 0 to 9999

@param $_ string

@return string
Avoid grouping whole numbers between 0 to 9999