ajax的json信息

在这里记录一下有关ajax的json代码

 1 <?php
 2 //在php里边生成json信息（json_encode()提供   json_decode()接收）
 3 //json_encode（数组、对象）；
 4
 5 //索引数组
 6 $color=array(‘red‘,‘blue‘,‘green‘);
 7 echo json_encode($color),"<br />"; //字符串  ["red","blue","green"]
 8
 9 //关联数组
10 $city=array(‘hebei‘=>‘shijiazhuang‘,‘shandong‘=>‘jinan‘,‘henan‘=>‘zhengzhou‘);
11 echo json_encode($city),"<br />";  //{"hebei":"shijiazhuang","shandong":"jinan","henan":"zhengzhou"}
12
13 //索引关联数组
14 $city1=array(‘hebei‘=>‘shijiazhuang‘,‘shandong‘=>‘jinan‘,‘henan‘=>‘zhengzhou‘,‘shanghai‘);
15 echo json_encode($city1),"<br />";  //{"hebei":"shijiazhuang","shandong":"jinan","henan":"zhengzhou","0":"shanghai"}
16
17 //多维数组，看当前维数的类型；
18 //关联/索引关联维数------>json对象
19 //索引----------------->json数组
20
21 //对象生成json信息
22 class Person{
23     public $name="tom";
24     public $age=23;
25     public function run(){
26             echo "is running";
27         }
28     }
29 $per=new Person();
30 //生成json信息只考虑“属性”
31 echo json_encode($per);  //{"name":"tom","age":23}

json反编码

 1 <?php
 2
 3 //解析、反编码json信息
 4
 5 $city=array(‘hebei‘=>‘shijiazhuang‘,‘shandong‘=>‘jinan‘,‘henan‘=>‘zhengzhou‘);
 6 $jn_city=json_encode($city);
 7
 8 //反编码
 9 //true和false的区别：
10 //true--->array(数组)   false--->object(对象)
11
12 $fan_city=json_decode($jn_city,false);
13 var_dump($fan_city);     //object(stdClass)#1 (3) { ["hebei"]=> string(12) "shijiazhuang" ["shandong"]=> string(5) "jinan" ["henan"]=> string(9) "zhengzhou" }
14
15 $fan_city=json_decode($jn_city,true);
16 var_dump($fan_city);  //array(3) { ["hebei"]=> string(12) "shijiazhuang" ["shandong"]=> string(5) "jinan" ["henan"]=> string(9) "zhengzhou" }
17
18 //给一个自定义的“json字符串”反编码操作
19 //反编码的json字符串对定义的“单双引号”有要求
20 $jn_str="{name:‘tom‘,color:‘red‘,age:‘5‘}";  //null
21 $jn_str="{‘name‘:‘tom‘,‘color‘:‘red‘,‘age‘:‘5‘}";  //null
22
23 $jn_str=‘{"name":"tom","color":"red","age":"5"}‘;  //string(38) "{"name":"tom","color":"red","age":"5"}"
24
25 $fan_str=json_decode($jn_str,true);
26 var_dump($jn_str);

自定义字符串反编码操作，对单双引号有要求（php版本问题）