extractBefore() extractBefore(string $str, integer $start_num, integer $end_num) : string 截取字符串前面n个字符 Parameters string $str integer $start_num integer $end_num Returns string
extractRear() extractRear(string $str, integer $num) : string 截取字符串最后n个字符 Parameters string $str integer $num Returns string
exitContain() exitContain(string $str, mixed $nee = 3, mixed $del = ', mixed $') : boolean bool 判断字符串是否包含某个字符 Parameters string $str mixed $nee mixed $del mixed $' Returns boolean
replace() replace(string $search, string $replace, string $subject) : string 替换字符串 Parameters string $search string $replace string $subject Returns string