Home >Backend Development >PHP Problem >Usage of json in php
Usage of json in php: json_encode() function is used to convert arrays and objects into json format; json_decode() function is used to convert json text into the corresponding php data structure, such as [json_decode($json ,ture)].
Starting from version 5.2, PHP natively provides json_encode() and json_decode() functions, the former is used for encoding, and the latter is used for decoding.
(Recommended tutorial: php video tutorial)
json_encode()
This function is mainly used to convert arrays and objects into json format.
Example:
$arr = array ('a'=>'a','b'=>'b','c'='c','d'=>'d','e'='e'); echo json_encode($arr);
json only accepts utf-8 encoded characters, and the parameters of json_encode() must be utf-8 encoded.
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;
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.
$json = '{"a":"hello","b":"world","c":"zhangsan","d":20,"e":170}'; var_dump(json_decode($json));
Normally, json_decode() always returns a PHP object.
Converted to an array:
$json = '{"a":"hello","b":"world","c":"zhangsan","d":20,"e":170}'; var_dump(json_decode($json,ture));
Related recommendations: php training
The above is the detailed content of Usage of json in php. For more information, please follow other related articles on the PHP Chinese website!