json（）函数 参数列表：

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)