CONCAT_WS Separator

i want to select a separator for CONCAT_WS() that not confilict by field value for example if i select "," maybe field value have string w开发者_开发技巧ith "," i want to select a seperator than not confilict by field value :(

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From here:

CONCAT_WS(char(22 using utf8), "this", "that");

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Hope U R USING PHP

choose your own separator like

$glue=®(alt 0174)


CONCAT_WS($glue,str1,$str2)