Write a regular substitution, replacing the

& lt？ Server-side programming language (abbreviation of professional hypertext preprocessor)

$str =' Hebei, Shijiazhuang, Beijing, Shanghai | Tianjin ||||| Chongqing | Baoding,,, Henan';

$str = preg_replace("/([，，||]+)/u "，" "，$ str)；

$ str = ltrim(rtrim($ str))；

print _ r($ str)；

& gt