Probleam using classes , array , json and php - php

Question

Hi, this is my first time trying to create some code in PHP and it took me a long time but I'm able to convert data to xml. Now I need create a JSON object and it's not going well. The biggest problem is trying to create a new class in PHP (I don't know if what I did is ok or not) and if this is the correct way to attach a list. I think some of it's good but to me since I only use java and c# it seems a little crazy. I think I'm doing something wrong. The line that's showing me an error is $array['data']->attach( new Cake($name,$ingredients,$prepare,$image)); but i don't know what I'm doing wrong.
I haven't yet written the line that includes and transforms the array into json
Thanks
//opens the file, if it doesn't exist, it creates
$pointer = fopen($file, "w");
// writes into json
$cake_list['data'] = new SplObjectStorage();
for ($i = 0; $i < $row; $i++) {
// Takes the SQL data
$name = mysql_result($sql, $i, "B.nome");
$ingredients = mysql_result($sql, $i, "B.ingredientes");
$prepare = mysql_result($sql, $i, "B.preparo");
$image = mysql_result($sql, $i, "B.imagem");
// assembles the xml tags
// $content = "{";
// $content .= "}";
$array['data']->attach( new Cake($name,$ingredients,$prepare,$image));
// $content .= ",";
// Writes in file
// echo $content;
$content = json_encode($content);
fwrite($pointer, $content);
// echo $content;
} // close FOR
echo cake_list;
// close the file
fclose($pointer);
// message
// echo "The file <b> ".$file."</b> was created successfully !";
// closes IF($row)
class Cake {
var $name;
var $ingredients;
var $prepare;
var $image;
public function __construct($name, $ingredients, $prepare, $image)
{
$this->name = $name;
$this->ingredients = $ingredients;
$this->prepare = $prepare;
$this->image = $image;
}
}
function create_instance($class, $arg1, $arg2, $arg3, $arg4)
{
$reflection_class = new ReflectionClass($class);
return $reflection_class->newInstanceArgs($arg1, $arg2,$arg3, $arg4);
}

Answer 1

The error you are experiencing is because you are doing $array['data'] when you mean $cake_list['data'] so change the error line to:
$cake_list['data']->attach(new Cake($name, $ingredients, $prepare, $image));
Also a simple way to simple way to create a JSON object (or more accurately a string representation of a JSON object) is to do this:
$array = array(
'name' => $name,
'ingredients' => $ingredients,
'prepare' => $prepare,
'image' => $image
);
$json = json_encode($array);
You can also create simple easy to use objects like this:
$myObject = new stdClass(); // stdClass() is generic class in PHP
$myObject->name = $name;
$myObject->ingredients = $ingredients;
$myObject->prepare = $prepare;
$myObject->image = $image;