How use json in php with a 'complex' structure? - php

Question

i want use json + php for my data. I read more document to do this, and the basic function are json_decode() and json_encode(). My problem is that, read more document and read different example of structure have created in me a lot of doubts.
I want create a structure like this begine from the basic to the container:
there is a Base, that have 2 property: id and value
there is a Operations that can have multiple Base
there is a Command that can have multiple Operations (and if possible a property callad name)
the structure in my mind is like this...
[ //The start of Commands
//Can make a property name here like "name":"puls1"
[ //Operation1
{ //Base1
"id":"22398",
"value":"255"
},
{ //Base2
"id":"22657",
"value":"80",
},
{ //Base3
"id":"7928",
"valore":"15"
}
],
[ //Operation2
{ //Base1
"id":"22398",
"value":"0"
},
{ //Base2
"id":"22657",
"value":"0",
},
{ //Base3
"id":"7928",
"valore":"0"
}
],
] //The close of Commands
But i have put the [ and { in the not correct order i think...
How can i make a json structure like this? And after set a command to insert a new Operation or remove Operation?
Thank's at all..
//Ok by answer of i made this code
class Base
{
var $i;
var $value;
function __construct($i,$v)
{
$this->id = $i;
$this->value = $v;
}
}
$a = new Base('1','11');
$b = new Base('2','10');
$c = new Base ('3','20');
$d = new Base ('4','30');
class Operation
{
var $name;
var $values = Array();
function __construct($a)
{
$this->name = $a;
}
public function addArray($a)
{
array_push($this->values,$a);
}
}
$oper1 = new Operation("op1");
$oper1->addArray($a);
$oper1->addArray($b);
$oper2= new Operation("op2");
$oper2->addArray($c);
$oper2->addArray($d);
$commands = Array($oper1,$oper2);
echo json_encode($tot);
Now the problem is how can i make the revert operation? Such a use of json_decode and incapsulate in its appropriate structure?

Answer 1

The json list type [] is equal to a array without keys in php.
The json dictionary type {}is equal to a keyed array in php.
What you want is something like this:
$json = array(
array(
array('id' => $num, 'value' => $val), // Base 1
array('id' => $num_1, 'value' => $val_1), // Base 3
array('id' => $num_2, 'value' => $val_2), // Base 2
),
array(...),
array(...),
);

Answer 2

If you're working with PHP I would construct the objects from native PHP Classes (json_encode works with php objects as well):
class Base {
var $id;
var $value;
}
Then it's just a matter of putting these objects in various arrays, which you can also abstract with methods like addToOperation($baseObj) and addToCommands($operationObj).
You're dealing with native data structures (Arrays), so you can use native methods to remove (array_pop) and add (array_push) data.

Answer 3

Something like this should work
// Build up your data as a mulitdimensional array
$data = array(
'operations' => array(
0 => array(
'bases' => array (
0 => array(
'id' => '22398',
'value' => 'whatever'
),
1 => array(
'id' => 'id goes here',
'value' => 'value goes here'
),
1 => array(
//data for operation 2
)
);
// Then use json_encode
$json = json_encode($data);
My syntax may not be perfect but that should give you the idea. To access it then you would use code like
$operations = json_decode($data);
foreach ($operations as $op) {
foreach ($op->bases as $base) {
//Logic goes here
}
}
Hope this helps.