php json相关函数用法示例

本文实例讲述了php json相关函数用法。分享给大家供大家参考，具体如下：

函数列表：

函数	描述
json_encode	对变量进行json编码
json_decode	对json格式的字符串进行解码，转换为php变量
json_last_error	返回最后发生的错误

For example 1: json_encode

$arr=array("A"=>"a","B"=>"b","C"=>"c","D"=>"d");
echo json_encode($arr);

output:

{"A":"a","B":"b","C":"c","D":"d"}

For example 2: json_decode

$arr='{"A":"a","B":"b","C":"c","D":"d"}';
var_dump(json_decode($arr));
var_dump(json_decode($arr,true));

output:

object(stdClass)[1]
 public 'A' => string 'a' (length=1)
 public 'B' => string 'b' (length=1)
 public 'C' => string 'c' (length=1)
 public 'D' => string 'd' (length=1)
array (size=4)
 'A' => string 'a' (length=1)
 'B' => string 'b' (length=1)
 'C' => string 'c' (length=1)
 'D' => string 'd' (length=1)