使用FIND_IN_SET函数：
WHERe ( FIND_IN_SET(events.name, mysql_real_escape_string($string)) > 0 OR FIND_IN_SET(events.cities, mysql_real_escape_string($string)) > 0 OR FIND_IN_SET(events.counties, mysql_real_escape_string($string)) > 0)
使用FIND_IN_SET函数：
WHERe ( FIND_IN_SET(events.name, mysql_real_escape_string($string)) > 0 OR FIND_IN_SET(events.cities, mysql_real_escape_string($string)) > 0 OR FIND_IN_SET(events.counties, mysql_real_escape_string($string)) > 0)
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