php處理json格式數(shù)據(jù)經(jīng)典案例總結(jié)，json經(jīng)典案例
Jun 13, 2016 am 08:39 AM
php處理json格式數(shù)據(jù)經(jīng)典案例總結(jié)，json經(jīng)典案例
本文實(shí)例總結(jié)了php處理json格式數(shù)據(jù)的方法。分享給大家供大家參考，具體如下：
1.json簡介：
何為json?
簡 單地說，JSON 可以將 JavaScript 對象中表示的一組數(shù)據(jù)轉(zhuǎn)換為字符串，然后就可以在函數(shù)之間輕松地傳遞這個字符串，或者在異步應(yīng)用程序中將字符串從 Web 客戶機(jī)傳遞給服務(wù)器端程序.
通俗點(diǎn)講，它是一種數(shù)據(jù)的存儲格式，就像php序列化后的字符串一樣。
它也是一種數(shù)據(jù)描述，比如：我們將一個數(shù)組序列化后存放，就可以很容易的反序列化后應(yīng)用；json也是如此，只不過它搭建的是客戶端javascript和服務(wù)器端php交互的橋梁。
如何使用json?
自php5.2開始及之后的版本都內(nèi)置了json的支持，主要有兩個函數(shù):
json_encode():編碼，生成一個json字符串
json_decode():一個解碼
注意:經(jīng)過json_encode()函數(shù)編碼后，將返回一個json格式的字符串，如:$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';將json格式的字符串輸出，將得到一個json格式的javascript對象
2.json案例一：
json_encode的使用:
<?php $arr = array( 'name' => '魏艷輝', 'nick' => '為夢翱翔, 'contact' => array( 'email' => 'zhuoweida@163.com', 'website' => 'http://zhuoweida.blog.tianya.cn', ) ); $json_string = json_encode($arr); echo $json_string;//json格式的字符串 ?>
結(jié)果：
{
"name":"\u9648\u6bc5\u946b",
"nick":"\u6df1\u7a7a",
"contact":
{
"email":"shenkong at qq dot com",
"website":"http:\/\/www.chinaz.com"
}
}
提示:輸出的數(shù)據(jù)本身就是json格式的js對象，因為沒有帶引號，所以在前臺頁面可以直接將其當(dāng)做json對象使用
總結(jié)：關(guān)聯(lián)數(shù)組是按照javascript對象來構(gòu)造的
分析:上述案例很簡單的將一個數(shù)組json化了，需要指出的是在非utf-8編碼下，中文字符將不可被encode，結(jié)果會出來空值，所以如果你使用gb2312編碼編寫php代碼，那么就需要將包含中文的內(nèi)容使用iconv或mb系列函數(shù)轉(zhuǎn)化為utf-8后在json_encode
3.json案例二：
json_decode的使用:
<?php $arr = array( 'name' => '魏艷輝', 'nick' => '為夢翱翔', 'contact' => array( 'email' => 'zhuoweida@163.com', 'website' => 'http://zhuoweida.blog.tianya.cn', ) ); $json_string = json_encode($arr); $obj = json_decode($json_string); //可以使用$obj->name訪問對象的屬性 $arr=json_decode($json_string,true);//將第二個參數(shù)為true時將轉(zhuǎn)化為數(shù)組 print_r($obj); print_r($arr); ?>
結(jié)果：
{
"name":"\u9648\u6bc5\u946b",
"nick":"\u6df1\u7a7a",
"contact":
{
"email":"shenkong at qq dot com",
"website":"http:\/\/www.chinaz.com"
}
}
總結(jié)：關(guān)聯(lián)數(shù)組是按照J(rèn)avaScript對象來構(gòu)造的
提示:輸出的數(shù)據(jù)本身就是json格式的js對象，因為沒有帶引號，所以在前臺頁面可以直接將其當(dāng)做json對象使用
分析:編碼后就要解碼，php提供了相應(yīng)的函數(shù)json_decode,執(zhí)行此函數(shù)后，將會得到一個對象或數(shù)組。
4.json案例三：
當(dāng)和前臺交互的時候，json的作用就顯示出來了:
例如：javascript代碼如下：
<script type="text/javascript">
var obj = {
"name":"\u9648\u6bc5\u946b",
"nick":"\u6df1\u7a7a",
"contact":
{
"email":"shenkong at qq dot com",
"website":"http:\/\/www.chinaz.com"
}
};
alert(obj.name);
</script>
代碼分析:上面代碼，直接將json格式數(shù)據(jù)賦給一個變量，它就變成一個javascript對象了，這樣我們可以很方便的對obj進(jìn)行遍歷
提示：在javascript中，數(shù)組的訪問是通過索引來訪問的；對象屬性的訪問是通過 對象名.屬性名 來訪問的
提示:輸出的數(shù)據(jù)本身就是json格式的js對象，因為沒有帶引號，所以在前臺頁面可以直接將其當(dāng)做json對象使用
5.json案例四：json跨域的數(shù)據(jù)調(diào)用:
例如：主調(diào)文件index.html
<script type="text/javascript">
function getProfile(str) {
var arr = str;
document.getElementById('nick').innerHTML = arr.nick;
}
</script>
<body>
<div id="nick"></div>
</body>
<script type="text/javascript" src="http://localhost/demo/profile.php"></script>
例如：被調(diào)用文件profile.php
<?php
$arr = array(
'name' => '魏艷輝',
'nick' => '為夢翱翔',
'contact' => array(
'email' => 'zhuoweida@163.com',
'website' => 'http://zhuoweida.blog.tianya.cn',
)
);
$json_string = json_encode($arr);
echo "getProfile($json_string)";
?>
代碼分析:當(dāng)index.html調(diào)用profile.php，json字符串生成，并作為參數(shù)傳入getProfile，然后將昵稱插入到div中 ，這樣一次跨域數(shù)據(jù)交互就完成了
6.js如何解析服務(wù)器端返回的json字符串？
我們在使用ajax做客戶端和服務(wù)器端交互的時候，在不適用jQuery等框架的前提下，一般的做法是讓服務(wù)器端返回一段json字符串，然后在客戶端將它解析成javascript對象。解析時用到的方法一般是eval或者是new function，而目前ie8和firefox3.1有內(nèi)置了原生的json對象。
例1：
var strTest='{"a":"b"}'; //轉(zhuǎn)換成JS對象
var obj=eval("("+strTest+")") ;
例2:
function strtojson(strTest){
JSON.parse(str);
}
7.案例五：對象的json化
<?php
//1.對象
class JsonTest{
var $id = 1;
var $name = 'heiyeluren';
$gender = '男';
}
$obj = new JsonTest;
echo json_encode($obj)."<br /> ";
?>
瀏覽器輸出結(jié)果：
{
"id":1,
"name":"heiyeluren",
"gender":"\u7537"
}
結(jié)論：對象的json字符串是按照javascript對象來構(gòu)造的。無法識別中文，所有的中文字符串沒有被正確顯示出來
分析:上述案例很簡單的將一個數(shù)組json化了，需要指出的是在非utf-8編碼下，中文字符將不可被encode，結(jié)果會出來空值，所以如果你使用gb2312編碼編寫php代碼，那么就需要將包含中文的內(nèi)容使用iconv或mb系列函數(shù)轉(zhuǎn)化為utf-8后在json_encode
提示:輸出的數(shù)據(jù)本身就是json格式的js對象，因為沒有帶引號，所以在前臺頁面可以直接將其當(dāng)做json對象使用
8.案例六：索引數(shù)組的json化
<?php $arr1 = array(1, 'heiyeluren', '男'); echo json_encode($arr1)."<br /> "; ?>
瀏覽器輸出結(jié)果：
[ 1, "heiyeluren", "\u7537" ]
結(jié)論：純數(shù)字索引數(shù)組的json字符串是按照javascript能夠識別的數(shù)組來存儲的，而不是按照javascript能夠識別的對象來存儲的。無法識別中文，所有的中文字符串沒有被正確顯示出來
分析:上述案例很簡單的將一個數(shù)組json化了，需要指出的是在非utf-8編碼下，中文字符將不可被encode，結(jié)果會出來空值，所以如果你使用gb2312編碼編寫php代碼，那么就需要將包含中文的內(nèi)容使用iconv或mb系列函數(shù)轉(zhuǎn)化為utf-8后在json_encode
9.案例七：關(guān)聯(lián)數(shù)組的json化
<?php
$arr2 = array("id"=>1, "name"=>'heiyeluren', "gender"=>'男');
echo json_encode($arr2)."<br /> ";
?>
瀏覽器輸出結(jié)果：
{
"id":1,
"name":"heiyeluren",
"gender":"\u7537"
}
結(jié)論：關(guān)聯(lián)索引數(shù)組的json字符串是按照javascript對象的形式來構(gòu)造的。無法識別中文，所有的中文字符串沒有被正確顯示出來
分析:上述案例很簡單的將一個數(shù)組json化了，需要指出的是在非utf-8編碼下，中文字符將不可被encode，結(jié)果會出來空值，所以如果你使用gb2312編碼編寫php代碼，那么就需要將包含中文的內(nèi)容使用iconv或mb系列函數(shù)轉(zhuǎn)化為utf-8后在json_encode
提示:輸出的數(shù)據(jù)本身就是json格式的js對象，因為沒有帶引號，所以在前臺頁面可以直接將其當(dāng)做json對象使用
10.案例八：對多維索引數(shù)組的進(jìn)行json化
<?php $arr3 = array(array(1, 'heiyeluren', '男'), array(1, 'heiyeluren', '男')); echo json_encode($arr3)."<br /> ";?>
瀏覽器輸出結(jié)果：
[ [1,"heiyeluren","\u7537"], [1,"heiyeluren","\u7537"] ]
結(jié)論：多維數(shù)字索引數(shù)組的json字符串是按照javascript能夠識別的數(shù)組來存儲的。無法識別中文，所有的中文字符串沒有被正確顯示出來
分析:上述案例很簡單的將一個數(shù)組json化了，需要指出的是在非utf-8編碼下，中文字符將不可被encode，結(jié)果會出來空值，所以如果你使用gb2312編碼編寫php代碼，那么就需要將包含中文的內(nèi)容使用iconv或mb系列函數(shù)轉(zhuǎn)化為utf-8后在json_encode
提示:輸出的數(shù)據(jù)可以直接將其當(dāng)做javascript數(shù)組使用
11.案例九：對多維關(guān)聯(lián)數(shù)組的進(jìn)行json化
<?php
$arr4 = array(
array("id"=>1, "name"=>'heiyeluren', "gender"=>'男'),
array("id"=>1, "name"=>'heiyeluren', "gender"=>'男')
);
echo json_encode($arr4)."<br /> ";
?>
瀏覽器輸出結(jié)果：
[
{"id":1,"name":"heiyeluren","gender":"\u7537"},
{"id":1,"name":"heiyeluren","gender":"\u7537"}
]
結(jié)論：多維關(guān)聯(lián)索引數(shù)組是按照外圍是JavaScript數(shù)組，中間的索引數(shù)組是對象。無法識別中文，所有的中文字符串沒有被正確顯示出來
分析:上述案例很簡單的將一個數(shù)組json化了，需要指出的是在非utf-8編碼下，中文字符將不可被encode，結(jié)果會出來空值，所以如果你使用gb2312編碼編寫php代碼，那么就需要將包含中文的內(nèi)容使用iconv或mb系列函數(shù)轉(zhuǎn)化為utf-8后在json_encode
提示:輸出的數(shù)據(jù)可以直接將其當(dāng)做javascript數(shù)組使用
12.案例十：json格式的javascript對象的創(chuàng)建
json的格式與語法：
var jsonobject=
{
//對象內(nèi)的屬性語法(屬性名與屬性值是成對出現(xiàn)的)
propertyname:value,
//對象內(nèi)的函數(shù)語法(函數(shù)名與函數(shù)內(nèi)容是成對出現(xiàn)的)
functionname:function(){...;}
};
注意：
①jsonobject -- JSON對象名稱
②propertyname -- 屬性名稱
③functionname -- 函數(shù)名稱
④一對大括號，括起多個"名稱/值"的集合
⑤屬性名或函數(shù)名可以是任意字符串，甚至是空字符串
⑥逗號用于隔開每對"名稱/值"對
提示：
①在javascript中，數(shù)組的訪問是通過索引來訪問的； 對象屬性的訪問是通過 對象名.屬性名? 來訪問的
②經(jīng)過json_encode()化而的數(shù)據(jù)都是js能夠識別的格式，而經(jīng)過json_decode()化的數(shù)據(jù)都是php能夠識別的格式，這一點(diǎn)大家心里要清楚
③經(jīng)過json_encode()化而輸出的數(shù)據(jù)都是json格式的javascript對象，在前臺可直接將其當(dāng)做js對象使用
另外，本站還提供了如下格式化與轉(zhuǎn)換工具方便大家使用：
php代碼在線格式化美化工具：
http://tools.jb51.net/code/phpformat
在線XML/JSON互相轉(zhuǎn)換工具：
http://tools.jb51.net/code/xmljson
JavaScript代碼美化/壓縮/格式化/加密工具：
http://tools.jb51.net/code/jscompress
在線XML格式化/壓縮工具：
http://tools.jb51.net/code/xmlformat
更多關(guān)于PHP相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《PHP中json格式數(shù)據(jù)操作技巧匯總》、《php文件操作總結(jié)》、《PHP運(yùn)算與運(yùn)算符用法總結(jié)》、《PHP網(wǎng)絡(luò)編程技巧總結(jié)》、《PHP基本語法入門教程》、《php操作office文檔技巧總結(jié)(包括word,excel,access,ppt)》、《php日期與時間用法總結(jié)》、《php面向?qū)ο蟪绦蛟O(shè)計入門教程》、《php字符串(string)用法總結(jié)》、《php+mysql數(shù)據(jù)庫操作入門教程》及《php常見數(shù)據(jù)庫操作技巧匯總》
希望本文所述對大家PHP程序設(shè)計有所幫助。
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