balping/json-raw-encoder

Encode arrays to json with raw JS objects (eg. callbacks) in them

v1.0.1 2020-06-06 16:24 UTC

This package is auto-updated.

Last update: 2022-01-06 19:38:51 UTC


README

Use this package to encode arrays to JSON with raw JS objects (eg. callbacks) in them.

Installation

composer require balping/json-raw-encoder

Usage

Suppose you need to pass a callback to a JSON object.

<?php
    $array = [
        'type' => 'cat',
        'count' => 42,
        'callback' => 'function(a){alert(a);}'
    ];
?>

<script>
    let bar = <?php echo json_encode($array); ?>;
    bar.callback('hello'); //error
</script>

However, the above array will be encoded as

{"type":"cat","count":42,"callback":"function(a){alert(a);}"}

On this object, you cannot call callback(), as callback is a string and not a function.

To get around this problem, use Raw objects provided by this package:

<?php
    use Balping\JsonRaw\Raw;
    use Balping\JsonRaw\Encoder;

    $array = [
        'type' => 'cat',
        'count' => 42,
        'callback' => new Raw('function(a){alert(a);}')
    ];
?>

<script>
    let bar = <?php echo Encoder::encode($array); ?>;
    bar.callback('hello'); //prints hello
</script>

Now, the encoded JSON looks like this. Notice, that there are no parentheses around the function.

{"type":"cat","count":42,"callback":function(a){alert(a);}}

Calling bar.callback() now works, as callback is a function and not a string.

Using with third party libraries

It is possible that the serialisation is done by a library (eg. Fractal), and not by your code, i.e. you cannot replace json_encode with Encoder::encode().

In this case, you can still pass callbacks to JSON, by passing the encoded json and an array of all raw objects to Replacer::replace():


use Balping\JsonRaw\Raw;
use Balping\JsonRaw\Replacer;

$rawObjects = [];

$array = [
    'type' => 'cat',
    'count' => 42,
    'callback' => $rawObjects[] = new Raw('function(a){alert(a);}')
];

// you cannot alter the behaviour of a third party encoder
$encoded = $thirdParty->jsonEncode($array);

echo Replacer::replace($encoded, $rawObjects);

Result:

{"type":"cat","count":42,"callback":function(a){alert(a);}}

License

This package is licensed under GPLv3.

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