php中json_encode和json_decode的用法

1.json_encode基本用法：數組轉字符串

<?php
$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);
echo json_encode($arr);
?>
以上例程會輸出：
{"a":1,"b":2,"c":3,"d":4,"e":5}

 2.json_decode基本用法：字符串轉數組

<?php 
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}'; 
var_dump(json_decode($json)); 
?> 
輸出
array{ 
["a"] => int(1) 
["b"] => int(2) 
["c"] => int(3) 
["d"] => int(4) 
["e"] => int(5)

3.json_encode在輸出漢字的時候會被轉義

$arr4 = array('t1'=>'測試下中文漢字','t2'=>'www.jd.com','t3'=>'123456789','t4'=>"!@#$%^&*",'t5'=>'漢字+www.jd.com+465454');
print_r(json_encode($arr4));exit;

輸出結果：（漢字都會被轉義）

{"t1":"\u6d4b\u8bd5\u4e0b\u4e2d\u6587\u6c49\u5b57","t2":"www.jd.com","t3":"123456789","t4":"!@#$%^&*","t5":"\u6c49\u5b57+www.jd.com+465454"}

4.如何保證json_encode不被轉義

$arr5 = array('t1'=>urlencode('測試下中文漢字'));    // 重點1
print_r(urldecode(json_encode($arr5)));            // 重點2

輸出結果：

{"t1":"測試下中文漢字"}

5.urlencode，json_encode,urldecode使用

$arr6 = urlencode('測試下中文漢字');
print_r($arr6);
print_r(json_encode($arr6));
print_r(urldecode($arr6));
print_r(urldecode(json_encode($arr6)));

輸出結果：

%E6%B5%8B%E8%AF%95%E4%B8%8B%E4%B8%AD%E6%96%87%E6%B1%89%E5%AD%97       // $arr6 輸出
"%E6%B5%8B%E8%AF%95%E4%B8%8B%E4%B8%AD%E6%96%87%E6%B1%89%E5%AD%97"    // json_encode輸出
測試下中文漢字                                                             // urldecode輸出結果
"測試下中文漢字"                                                          // urldecode+json_encode輸出結果

6.Jquery調取php的json_encode內容

php代碼

$arr = Array
(
    [goods_id] => 1
    [goods_sn] => LX000000
    [goods_name] => 保稅區直發 德國Aptamil愛他美嬰幼兒配方奶粉Pre段800g 【2罐起發】
)
echo json_encode($arr)

輸出格式

{"id":"1","user_id":"1","goods_id":"1","goods_stock":"6","goods_sn":"LX000000","shop_price":168}

js輸出json格式內容

function t(n,v){
    res = Ajax.call('user.php?act=depot_id', 'id=1',null,"GET", "JSON",false);
    
    var goods_title = "#goods_title_"+n;
    var goods_name = "#goods_name_"+n;
    var goods_price = "#goods_price_"+n;
    
    $(goods_title).val(res.goods_title);
    $(goods_name).val(res.goods_name);
    $(goods_price).val(res.goods_price);

    

    alert(res.goods_name);
    //document.getElementById(div).value = '11';    
}

 7.json_decode 有stdClass Object，解決辦法json_decode($s,true)，

$s = '[{"goods_id":"2","goods_num":2,"goods_name":"u8377u5170Nutrilonu725bu680fu5976u7c89 u30102u7f50u8d77u53d1u3011"},{"goods_id":"2","goods_num":2,"goods_name":"u8377u5170Nutrilonu725bu680fu5976u7c89 u30102u7f50u8d77u53d1u3011"}]';

f=jsondecode( s);

輸出：

Array
(
    [0] => stdClass Object
        (
            [goods_id] => 2
            [goods_num] => 2
            [goods_name] => u8377u5170Nutrilonu725bu680fu5976u7c89 u30102u7f50u8d77u53d1u3011
        )

    [1] => stdClass Object
        (
            [goods_id] => 2
            [goods_num] => 2
            [goods_name] => u8377u5170Nutrilonu725bu680fu5976u7c89 u30102u7f50u8d77u53d1u3011
        )

)

解決辦法：

f=jsondecode( s,true);
print_r($f);

輸出：

Array
(
    [0] => Array
        (
            [goods_id] => 2
            [goods_num] => 2
            [goods_name] => u8377u5170Nutrilonu725bu680fu5976u7c89 u30102u7f50u8d77u53d1u3011
        )

    [1] => Array
        (
            [goods_id] => 2
            [goods_num] => 2
            [goods_name] => u8377u5170Nutrilonu725bu680fu5976u7c89 u30102u7f50u8d77u53d1u3011
        )

)

 

8.json漢字被轉義 JSON_UNESCAPED_UNICODE 最簡單方法

return json_encode($arr, JSON_UNESCAPED_UNICODE);   //  php 5.3以上版本可以使用 （JSON_UNESCAPED_UNICODE）

 轉自：http://www.cnblogs.com/wesky/p/4590953.html