Read Associative Array from JSON in $_Post

Read associative array from json in $_POST

You can avoid to use JSON.stringify and json_decode:

jQuery.post("save.php", dataToSend, function(data){ alert(data); });

And:

<?php
echo $_POST['page'];
?>

Update:

... but if your really want to use them, then:

jQuery.post("save.php",  {json: JSON.stringify(dataToSend)}, function(data){ alert(data); });

And:

<?php
$value = json_decode($_POST['json']);
echo $value->page;
?>

Read associative array from json received from $_POST

You can use the json_decode` function

$channels = json_decode(file_get_contents('php://input')); // parse raw post
print_r($channels) // print structure of channels

How to converting JSON text to PHP associative array

$assocArray = json_decode($data, true);

The second parameter set the result as an object(false, default) or an associative array(true).

JSON to PHP Associative array

i asume your json comes via ajax.... (otherwise the code works with json_decode)
so be sure the js json stringifys your object and

you'll need to stripslashes before json_decode ;-) in php

How to extract and access data from JSON with PHP?

Intro

First off you have a string. JSON is not an array, an object, or a data structure. JSON is a text-based serialization format - so a fancy string, but still just a string. Decode it in PHP by using json_decode().

 $data = json_decode($json);

Therein you might find:

scalars: strings, ints, floats, and bools
nulls (a special type of its own)
compound types: objects and arrays.

These are the things that can be encoded in JSON. Or more accurately, these are PHP's versions of the things that can be encoded in JSON.

There's nothing special about them. They are not "JSON objects" or "JSON arrays." You've decoded the JSON - you now have basic everyday PHP types.

Objects will be instances of stdClass, a built-in class which is just a generic thing that's not important here.

Accessing object properties

You access the properties of one of these objects the same way you would for the public non-static properties of any other object, e.g. $object->property.

$json = '
{
    "type": "donut",
    "name": "Cake"
}';

$yummy = json_decode($json);

echo $yummy->type; //donut

Accessing array elements

You access the elements of one of these arrays the same way you would for any other array, e.g. $array[0].

$json = '
[
    "Glazed",
    "Chocolate with Sprinkles",
    "Maple"
]';

$toppings = json_decode($json);

echo $toppings[1]; //Chocolate with Sprinkles

Iterate over it with foreach.

foreach ($toppings as $topping) {
    echo $topping, "\n";
}

Glazed

Chocolate with Sprinkles

Maple

Or mess about with any of the bazillion built-in array functions.

Accessing nested items

The properties of objects and the elements of arrays might be more objects and/or arrays - you can simply continue to access their properties and members as usual, e.g. $object->array[0]->etc.

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": [
        { "id": "5002", "type": "Glazed" },
        { "id": "5006", "type": "Chocolate with Sprinkles" },
        { "id": "5004", "type": "Maple" }
    ]
}';

$yummy = json_decode($json);

echo $yummy->toppings[2]->id; //5004

Passing `true` as the second argument to json_decode()

When you do this, instead of objects you'll get associative arrays - arrays with strings for keys. Again you access the elements thereof as usual, e.g. $array['key'].

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": [
        { "id": "5002", "type": "Glazed" },
        { "id": "5006", "type": "Chocolate with Sprinkles" },
        { "id": "5004", "type": "Maple" }
    ]
}';

$yummy = json_decode($json, true);

echo $yummy['toppings'][2]['type']; //Maple

Accessing associative array items

When decoding a JSON object to an associative PHP array, you can iterate both keys and values using the foreach (array_expression as $key => $value) syntax, eg

$json = '
{
    "foo": "foo value",
    "bar": "bar value",
    "baz": "baz value"
}';

$assoc = json_decode($json, true);
foreach ($assoc as $key => $value) {
    echo "The value of key '$key' is '$value'", PHP_EOL;
}

Prints

The value of key 'foo' is 'foo value'

The value of key 'bar' is 'bar value'

The value of key 'baz' is 'baz value'

Don't know how the data is structured

Read the documentation for whatever it is you're getting the JSON from.

Look at the JSON - where you see curly brackets {} expect an object, where you see square brackets [] expect an array.

Hit the decoded data with a print_r():

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": [
        { "id": "5002", "type": "Glazed" },
        { "id": "5006", "type": "Chocolate with Sprinkles" },
        { "id": "5004", "type": "Maple" }
    ]
}';

$yummy = json_decode($json);

print_r($yummy);

and check the output:

stdClass Object
(
    [type] => donut
    [name] => Cake
    [toppings] => Array
        (
            [0] => stdClass Object
                (
                    [id] => 5002
                    [type] => Glazed
                )

            [1] => stdClass Object
                (
                    [id] => 5006
                    [type] => Chocolate with Sprinkles
                )

            [2] => stdClass Object
                (
                    [id] => 5004
                    [type] => Maple
                )

        )

)

It'll tell you where you have objects, where you have arrays, along with the names and values of their members.

If you can only get so far into it before you get lost - go that far and hit that with print_r():

print_r($yummy->toppings[0]);

stdClass Object
(
    [id] => 5002
    [type] => Glazed
)

Take a look at it in this handy interactive JSON explorer.

Break the problem down into pieces that are easier to wrap your head around.

`json_decode()` returns `null`

This happens because either:

The JSON consists entirely of just that, null.
The JSON is invalid - check the result of json_last_error_msg or put it through something like JSONLint.
It contains elements nested more than 512 levels deep. This default max depth can be overridden by passing an integer as the third argument to json_decode().

If you need to change the max depth you're probably solving the wrong problem. Find out why you're getting such deeply nested data (e.g. the service you're querying that's generating the JSON has a bug) and get that to not happen.

Object property name contains a special character

Sometimes you'll have an object property name that contains something like a hyphen - or at sign @ which can't be used in a literal identifier. Instead you can use a string literal within curly braces to address it.

$json = '{"@attributes":{"answer":42}}';
$thing = json_decode($json);

echo $thing->{'@attributes'}->answer; //42

If you have an integer as property see: How to access object properties with names like integers? as reference.

Someone put JSON in your JSON

It's ridiculous but it happens - there's JSON encoded as a string within your JSON. Decode, access the string as usual, decode that, and eventually get to what you need.

$json = '
{
    "type": "donut",
    "name": "Cake",
    "toppings": "[{ \"type\": \"Glazed\" }, { \"type\": \"Maple\" }]"
}';

$yummy = json_decode($json);
$toppings = json_decode($yummy->toppings);

echo $toppings[0]->type; //Glazed

Data doesn't fit in memory

If your JSON is too large for json_decode() to handle at once things start to get tricky. See:

Processing large JSON files in PHP
How to properly iterate through a big json file

How to sort it

See: Reference: all basic ways to sort arrays and data in PHP.

json_decode to array

As per the documentation, you need to specify true as the second argument if you want an associative array instead of an object from json_decode. This would be the code:

$result = json_decode($jsondata, true);

If you want integer keys instead of whatever the property names are:

$result = array_values(json_decode($jsondata, true));

However, with your current decode you just access it as an object:

print_r($obj->Result);

calling values from JSON associative array in JQUERY

[] denotes arrays in JSON, and {}, likewise, denote objects.

So at least in your example, since it's of the form [{},{},...], you have to access by array first, then the object.

// something like
var foo = scifi[1].Captain;

Note that what you have is not an associative array at all (for what definition an "associative array" has in Javascript at least).

To have something akin to an associative array, you'd still use objects:

var scifi = {
    TNG : {
        Ship : 'Enterprise',
        Captain : 'Picard'
    },
    BSG : {
        Ship : 'Galactica',
        Captain : 'Adama'
    },
    Firefly : {
        Ship : 'Serenity',
        Captain : 'Reynolds'
    }
};

Then you'd be able to access that like:

var foo = scifi.TNG.Captain;   // Picard
var bar = scifi.BSG.Ship;      // Galactica

If you really have to work with the format you have, but would like to work with the format I've given, then you can just convert your original data:

var new_scifi = {};
$.each(scifi, function (i,v) {
    new_scifi[v.Show] = {
        Ship = v.Ship,
        Captain = v.Captain
    };
});

console.log(new_scifi.Firefly.Captain);  // Reynolds

PHP read JSON Array with unknown variable

To get all shortName you can loop your array:

foreach ($json_data['assets'] as $key => $data) {
    print_r($data['shortName']);
}

If you want just shortName of first element, then use current:

$item = current($json_data['assets']);

print_r($item['shortName']);

Read Associative Array from JSON in $_Post