对象、json、数组之间的转换

来源：互联网发布：淘宝网老年棉拖鞋编辑：程序博客网时间：2024/05/22 12:43

数组转换

PHP 中，有三种数组类型：

索引数组 - 带有数字索引的数组
关联数组 - 带有指定键的数组
多维数组 - 包含一个或多个数组的数组

array() 函数用于创建数组:

索引数组

$indexArr = array("Peter","Ben","Joe");

关联数组

$assocArr = array("Peter"=>"12","Ben"=>"13","Joe"=>"5");

将数组转化为json格式：

$assocArr = array("Peter"=>"12","Ben"=>"13","Joe"=>"5");        var_dump($assocArr);    var_dump(json_encode($assocArr));

输出：

array(3) {  ["Peter"]=>  string(2) "12"  ["Ben"]=>  string(2) "13"  ["Joe"]=>  string(1) "5"}string(35) "{"Peter":"12","Ben":"13","Joe":"5"}"

json转换

<?php$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';var_dump(json_decode($json));//转化为对象var_dump(json_decode($json, true));//转化为数组?>

输出

object(stdClass)#1 (5) {  ["a"]=>int(1)  ["b"]=>int(2)  ["c"]=>int(3)  ["d"]=>int(4)  ["e"]=>int(5)}array(5) {  ["a"]=>int(1)  ["b"]=>int(2)  ["c"]=>int(3)  ["d"]=>int(4)  ["e"]=>int(5)}

简单模仿一下json解析

function simple_json_parser($json){        $json = str_replace("{","",str_replace("}","", $json));        $jsonValue = explode(",", $json);        $arr = array();        foreach($jsonValue as $v){            $jValue = explode(":", $v);            $arr[str_replace('"',"", $jValue[0])] = (str_replace('"', "", $jValue[1]));        }        return $arr;    }        $json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';    $json_parser = simple_json_parser($json);    $json2arr = json_decode($json, true);    var_dump($json_parser);    var_dump($json2arr);

输出

array(5) {  ["a"]=>  string(1) "1"  ["b"]=>  string(1) "2"  ["c"]=>  string(1) "3"  ["d"]=>  string(1) "4"  ["e"]=>  string(1) "5"}array(5) {  ["a"]=>  int(1)  ["b"]=>  int(2)  ["c"]=>  int(3)  ["d"]=>  int(4)  ["e"]=>  int(5)}

对象转换

将对象转换为数组

   function objToArr($obj){        if(!is_object($obj) && !is_array($obj)) {            return $obj;        }        $arr = array();        foreach($obj as $k => $v){            $arr[$k] = objToArr($v);        }        return $arr;    }    $json = '{"a":1, "b":2, "c":3, "d":4, "e":5}';    $json2obj = json_decode($json);        var_dump($json2obj);    var_dump(objToArr($json2obj));

输出

object(stdClass)#1 (5) {  ["a"]=>int(1)  ["b"]=>int(2)  ["c"]=>int(3)  ["d"]=>int(4)  ["e"]=>int(5)}array(5) {  ["a"]=>int(1)  ["b"]=>int(2)  ["c"]=>int(3)  ["d"]=>int(4)  ["e"]=>int(5)}

0 0