PHP JSon How to read boolean value received in JSon format and write in string on PHP

Question

I receive this JSON string from another site and I cannot modify what received from. The string is receive in $_POST and is :

[
    {
        "clientId":"17295c59-4373-655a-1141-994aec1779dc",
        "channel":"\/meta\/connect",
        "connectionType":"long-polling",
        "ext":{
            "fm.ack":false,
            "fm.sessionId":"22b0bdcf-4a35-62fc-3764-db4caeece44b"
        },
        "id":"5"
    }
]

I decode the JSON string with the following code :

$receive = json_decode(file_get_contents('php://input'));

And when I use print_r($receive) I get the following:

Array (
[0] => stdClass Object
    (
        [clientId] => 17295c59-4373-655a-1141-994aec1779dc
        [channel] => /meta/connect
        [connectionType] => long-polling
        [ext] => stdClass Object
            (
                [fm.ack] => 
                [fm.sessionId] => 22b0bdcf-4a35-62fc-3764-db4caeece44b
            )

        [id] => 5
    )
)

I can access and read all Array / Object with no problem :

$receive[$i]->clientId;
$receive[$i]->channel;
$connectionType = $receive[$i]->connectionType;
$receive[$i]->id;
$receive[$i]->ext->{'fm.sessionId'};

But {fm.ack} is empty

In the decoded JSON string, the false value is not between "".

Is it possible to access and read the false value and convert it into string value instead?

Thank you for your helping !

what is the behaviour if there is true in the JSON ?

MatRt
– MatRt

2013-02-26 04:20:23 +00:00
Commented Feb 26, 2013 at 4:20 — MatRt
– MatRt, Commented Feb 26, 2013 at 4:20

anoopjohn · Accepted Answer · 2019-11-25 11:18:34Z

11

you can use it like this, in JSON format when you evaluate false value it will give you blank, and when you evaluate true it will give you 1.

$str = '[{"clientId":"17295c59-4373-655a-1141-994aec1779dc","channel":"\/meta\/connect","connectionType":"long-polling","ext":{"fm.ack":false,"fm.sessionId":"22b0bdcf-4a35-62fc-3764-db4caeece44b"},"id":"5"}]';

$arr = json_decode($str,true);

if($arr[0]['ext']['fm.ack'])    // suggested by **mario**
{
    echo "true";    
}
else {
    echo "false";   
}

edited Nov 25, 2019 at 11:18

anoopjohn

5285 silver badges19 bronze badges

answered Feb 26, 2013 at 4:21

Yogesh Suthar

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7 Comments

mario Over a year ago

PHP also has a false. Why not compare against that? That's what the decoded JSON array contains.

Yogesh Suthar Over a year ago

@mario Yeah we can also comapare with false. Thanks for pointing out.

LiTHiUM2525 Over a year ago

so if i try : if($receive[0]->ext->{'fm.ack'} == "") { echo "false"; } else { echo "true"; } it's work !!! Thank you !

LiTHiUM2525 Over a year ago

@YogeshSuthar yes i know it so is working only if i hardcode my JSon string, not working when i receive JSon string on $_POST the only code can read the string is $receive = json_decode(file_get_contents('php://input')); and not work if i add ,true... so your solution to test if == "" for false else true working well. Thank you

Richard Clayton Over a year ago

This is so ghetto. Running into this problem right now. In what world should a valid JSON value of "false" be returned as "blank"?

|

Christian · Accepted Answer · 2015-12-03 14:16:05Z

5

I know there is already an answer to this but it may be worth noting that var_dump outputs Boolean values better it just has worse formatting IMO.

<pre>
    <?php
        print_r(array(true, false));
        var_dump(array(true, false));
    ?>
</pre>

Results in

Array
(
    [0] => 1
    [1] => 
)
array(2) {
  [0]=>
  bool(true)
  [1]=>
  bool(false)
}

answered Dec 3, 2015 at 14:16

Christian

1,57712 silver badges16 bronze badges

1 Comment

soger Over a year ago

This should be the accepted answer. Booleans were there all along, it's just that print_r() doesn't show them correctly.

Павел Ковалёв · Accepted Answer · 2017-03-23 04:24:57Z

1

It's a very simple. If you use js to generate and transfer json, pass your variable not in its pure form but: youBoolVar + 0, then false will be 0, and true 1

answered Mar 23, 2017 at 4:24

Павел Ковалёв

111 bronze badge

1 Comment

Timothy Ryan Over a year ago

this seems like the simplest answer. worked for me.

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