A brief analysis of json_encode() and json_decode()_php basics in php

json_encode()                                                                                         

This function is mainly used to convert arrays and objects into json format.

Copy code The code is as follows:

$arr = array ('a'=>' a','b'=>'b','c'='c','d'=>'d','e'='e');
echo json_encode($arr);

Output results:

json only accepts utf-8 encoded characters, and the parameters of json_encode() must be utf-8 encoded.

Copy code The code is as follows:

class person
{
public $ name;
public $age;
public $height;
function __construct($name,$age,$height)
{
$this->name = $name;
$ this->age = $age;
$this->height = $height;
}
}

$obj = new person("zhangsan",20,100);
$foo_json = json_encode($obj);
echo $foo_json;

Output results:

When the attributes in the class are private variables, they will not be output.

json_decode()                                                                                        

This function is used to convert json text into the corresponding PHP data structure.

Copy code The code is as follows:

$json = '{"a":"hello","b":"world","c":"zhangsan","d":20 ,"e":170}';
var_dump(json_decode($json));

Output results:

Normally, json_decode() always returns a PHP object.

Convert to array:

Copy code The code is as follows:

$json = '{"a":"hello ","b":"world","c":"zhangsan","d":20,"e":170}';
var_dump(json_decode($json,ture));