正则表达式函数：preg_match_all 比如匹配 p/p 之间的字符： '/p([\s\S]*)\/p/i'

1.字符串转化为数组：explode() $label = "张三,李四,王五,赵六";$labelArray = explode(",",$label);// ","为分隔符，$label为要操作的变量 $labelArray就是我们需要的数组 2.数组转化为字符串：implode() $labelArray=['张三','李四','王五'];$label = implode(",&q..