使用JSON

 查看新版的PHP手册中JSON函数一节,JSON就增加了两个API,json_decode(),对一个json字符串进行解码,json_encode()是生成一个json字符串,我们就简单的测试一下。

构建如下PHP代码:


<? php

// 对象

class JsonTest{

var $id = 1 ;

var $name = ' heiyeluren ' ;

var $gender = ' ' ;

}

$obj = new JsonTest;

echo json_encode( $obj ) . " <br /> " ;



// 数字索引数组

$arr1 = array ( 1 , ' heiyeluren ' , ' ' );

echo json_encode( $arr1 ) . " <br /> " ;



// 关联索引数组

$arr2 = array ( " id " => 1 , " name " => ' heiyeluren ' , " gender " => ' ' );

echo json_encode( $arr2 ) . " <br /> " ;



// 多维数字索引数组

$arr3 = array ( array ( 1 , ' heiyeluren ' , ' ' ) , array ( 1 , ' heiyeluren ' , ' ' ));

echo json_encode( $arr3 ) . " <br /> " ;



// 关联索引数组

$arr4 = array ( array ( " id " => 1 , " name " => ' heiyeluren ' , " gender " => ' ' ) , array ( " id " => 1 , " name " => ' heiyeluren ' , " gender " => ' ' ));

echo json_encode( $arr4 ) . " <br /> " ;

?>

浏览器输出:

{"id":1,"name":"heiyeluren","gender":""}

[1,"heiyeluren",""]

{"id":1,"name":"heiyeluren","gender":""}

[[1,"heiyeluren",""],[1,"heiyeluren",""]]

[{"id":1,"name":"heiyeluren","gender":""},{"id":1,"name":"heiyeluren","gender":""}]



按照JSON格式定义,我们可以发现上面的几个特点:

1. 纯的数字索引是按照JavaScript能够识别的数组来存储的

2. 关联索引数组是按照JavaScript对象的形式来构造的

3. 多维关联索引是按照外围是JavaScript数组,中间的索引数组是对象

4. 无法识别中文,所有的中文字符串显示为空

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