PHP中生成json信息的方法

PHP中生成json信息的方法<？php//php中生成json信息
//json_encode（数组/对象）$color = array（"red","blue","green"）; //【索引数组】
echo json_encode（$color）,"<br />"; //["red","blue","green"]$animal = array（"east"=>"tiger","north"=>"wolf","south"=>"monkey"）; //【关联数组】
echo json_encode（$animal）,"<br />";//{"east":"tiger","north":"wolf","south":"monkey"}//【索引关联数组】
$animal2 = array（"east"=>"tiger","north"=>"wolf","duck","south"=>"monkey"）;
echo json_encode（$animal2）,"<br />";//{"east":"tiger","north":"wolf","0":"duck","south":"monkey"}//[{},{},{}]
//{"weatherinfo":{"city":"北京","cityid":"101010100","temp":"9","WD":"南风","WS":"2级","SD":"26%","WSE":"2","time":"10:20","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1014"}}
//{名称:[],名称:[],名称:[]}
//【对象生成json信息】
class Person{
public $addr = "beijing";
public $height = 170;
public function study（）{
echo "study php";
}
}
$tom = new Person（）;
//只是对象的属性给生成json信息
echo json_encode（$tom）;//{"addr":"beijing","height":170}

1.json

json_encode（数组/对象）------------>生成json信息，json_decode（json信息）; 反编码json信息对json字符串信息进行反编码，变为当前语言可以识别的信息。

2. javascript接收处理json信息

通过eval（）把接收的json字符串变成真实的对象信息代码如下：<！DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<title>新建网页</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="" />
<meta name="keywords" content="" /> <script type="text/javascript">
function showweather（）{
//利用ajax获得天气预报信息
//利用javascript+dom处理并显示天气信息
var xhr = new XMLHttpRequest（）;
xhr.onreadystatechange = function（）{
if（xhr.readyState==4）{
//alert（xhr.responseText）;
console.log（typeof xhr.responseText）;//string
//要把接收的“字符串”变为“对象”
//"{"addr":"u5317u4eac","temp":"9-22","wind":"north4-5"}"
eval（"var info="+xhr.responseText）; var str = "地址："+info.addr+";温度:"+info.temp+";风向:"+info.wind;
document.getElementById（"result"）.innerHTML = str;
}
}
xhr.open（"get","./03.php"）;
xhr.send（null）;
}
window.onload = function（）{
showweather（）;
}

// //s字符串变为对象obj
// var s = "{name:"tom",height:170}";
// //"var obj="+"{name:"tom",height:170}"====>"var obj={name:"tom",height:170}"
// //console.log（"var obj="+s）;
// eval（"var obj="+s）;
// console.log（obj）;//Object { name="tom", height=170} </script> <style type="text/css">
</style>
</head>
<body>
<h2>获得天气预报接口信息</h2>
<div id="result"></div>
</body>
</html>本文永久更新链接地址：http://www.linuxidc.com/Linux/2016-10/136254.htm