How to get all public properties of a class as json? - php

Question

Consider following example:
<?php
class p{
public $name = 'jimmy';
public $sex = 'male';
private $age = 31;
// there should be more unknow properties here ..
function test(){
echo $this->name;
}
function get_p_as_json(){
// how can i get json of this class which contains only public properties ?
// {"name":"jimmy","sex":"male"}
}
}
$p = new p();
$json = $p->get_p_as_json();
echo $json;
Question: How to get all public properties of a class as JSON?

Answer 1

You just create another class q extends from p. And then the code looks like following:
class p {
public $name = 'jimmy';
public $sex = 'male';
private $age = 31;
// there should be more unknown properties here ..
function test(){
echo $this->name;
}
}
class q extends p {
function get_p_as_json($p) {
return json_encode(get_object_vars($p));
}
}
$q = new q();
$p = new p();
$json = $q->get_p_as_json($p);
echo $json;

Answer 2

$a = array();
$reflect = new ReflectionClass($this /* $foo */);
$props = $reflect->getProperties(ReflectionProperty::IS_PUBLIC);
foreach ($props as $prop) {
/* here you can filter for spec properties or you can do some recursion */
$a[ $prop->getName() ] = $a[ $prop->getValue()];
}
return json_encode($a);

Answer 3

Since the public members can also be accessed outside of the class..
Accessing members outside of the class
$p = new p();
foreach($p as $key => $value) {
$arr[$key]=$value;
}
Demo
Accessing the public members within the class by making use of ReflectionClass
<?php
class p{
public $name = 'jimmy';
public $sex = 'male';
private $age = 31;
// there should be more unknow properties here ..
function test(){
echo $this->name;
}
function get_p_as_json(){
static $arr;
$reflect = new ReflectionClass(p);
$props = $reflect->getProperties(ReflectionProperty::IS_PUBLIC);
foreach ($props as $prop) {
$arr[$prop->getName()]=$prop->getValue($this); //<--- Pass $this here
}
return json_encode($arr);
}
}
$p = new p();
echo $json=$p->get_p_as_json();
Demo

Answer 4

The best way to do this would not be to call a method of the class, per se.
However, you could initiate the following:
$myPublicMethodsInJson = json_encode(get_class_methods($p));
However, you would not be able to call get_class_methods from within the class because it will return ALL of your methods, private and public. When you call it from outside of the class it will only return the public methods.