#### 把数组组合成字符串 ~~~ $arr = array('Hello','World!','I','love','Shanghai!'); echo implode(" ",$arr); ~~~ #### 把字符串打散为数组 ~~~ $str = "Hello,world,I love,Shanghai!"; print_r (explode(",",$str));//以逗号为分隔符 ~~~ #### 二维数组转一维数组 ~~~ $a = array( array( 'id' => 5698, ), array( 'id' => 4767, ), array( 'id' => 3809, ) ); //参数一:需要的二维数组;参数二:需要的一位数组的键 $last_names = array_column($a, 'last_name'); print_r($last_names); ~~~