PHP如何返回json格式的数据给jquery
json格式的数据是我们在应用开发中一直会使用到的数据,如与jquery打交到或与api打交都会使用到json数据,那么PHP如何返回json格式的数据给jquery呢,下面我来给各位同学介绍介绍.
在jquery中操作json数据我们直接 $.parseJSON(returnString ) 了
实例代码如下:
$(function () {
$('#send').click(function () {
$.getJSON('test.js', function (data) {
$('#resText').emptyempty();
var html = '';
$.each(data, function (commentIndex, comment) {
html += '<div class="comment"><h6 id="nbsp-nbsp-comment-username-nbsp-nbsp">' + comment['username'] + ':</h6><p class="para">' + comment['content'] + '</p></div>';
})
$('#resText').html(html);
})
})
})你需要做的就是将数据存储为格式正确的 .json或者.js 文件.以下为示例所传送的json格式的数据
实例代码如下:
[
{
"username": "张三",
"content": "沙发."
},
{
"username": "李四",
"content": "板凳."
},
{
"username": "王五",
"content": "地板."
}
]上面讲到到的json数据是固定了,我们用php如何返回json数据呢
php输出JSON格式方法
页面中加入header('Content-type: text/json');这个头就是告知此文件输出类型为 json,这种形式我们见的最多的是验证码——php输出验证图片,有时php可以输出css文件,js文件等做一些有趣的事情.好的,我们测试一下吧
实例代码如下:
<?php
header('Content-type: text/json');
$fruits = array (
"fruits" => array("a" => "orange", "b" => "banana", "c" => "apple"),
"numbers" => array(1, 2, 3, 4, 5, 6),
"holes" => array("first", 5 => "second", "third")
);
echo json_encode($fruits);
?>从数据库读取的数据生成json格式
实例代码如下:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>第一php网提供的教程--将数据库读取的数据生成json格式</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="http://libs.useso.com/ajax/libs/jquery/1.4/jquery.min.js" type="text/javascript"/></script>
<script language=javascript>
</script>
</head>
<body>
<pre class="brush:php;toolbar:false">
<h1 id="请注意两种方法生成的对象数组在结构上的区别">请注意两种方法生成的对象数组在结构上的区别</h1>
<?php
echo '<h1 id="法一">法一</h1>';
//假设以下数组是根据我们从数据库读取的数据生成的
$jarr=array('total'=>239,'row'=>array(
array('code'=>'001','name'=>'中国','addr'=>'Address 11','col4'=>'col4 data'),
array('code'=>'002','name'=>'Name 2','addr'=>'Address 12','col4'=>'col4 data'),
)
);
//法一:
$jobj=new stdclass();//实例化stdclass,这是php内置的空类,可以用来传递数据,由于json_decode后的数据是以对象数组的形式存放的,
//所以我们生成的时候也要把数据存储在对象中
foreach($jarr as $key=>$value){
$jobj->$key=$value;
}
print_r($jobj);//打印传递属性后的对象
echo '使用$jobj->row[0]['code']输出数组元素:'.$jobj->row[0]['code'].'<br>';
echo '编码后的json字符串:'.json_encode($jobj).'<br>';//打印编码后的json字符串
//法二:
echo '<hr>';
echo '<h1 id="法二">法二</h1>';
echo '编码后的json字符串:';
echo $str=json_encode($jarr);//将数组进行json编码
echo '<br>';
$arr=json_decode($str);//再进行json解码
print_r($arr);//打印解码后的数组,数据存储在对象数组中
echo '使用$arr->row[0]->code输出数组元素:'.$arr->row[0]->code;
?>
</body>
</html>
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