plugins - $_POST field value gets altered after "init"

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I'm new to wordpress development.

I'm trying to develop a simple plugin for practice. It involves a form submission from the frontend. The form has an input with the following code.

<input type='hidden' name='test' value='{"id": 1}'/>

When I submit the form, the value of 'test' field gets altered after the "init" hook.

My plugin code looks like the following

add_action('init', [$this, 'init']);

function init() {
    printe_r($_POST);
}

Output:

Array
(
    [test] => {\"id\":1}
)

The problem is that json_decode errors out. I have to use stripslashes like below to decode the json string.

json_decode(stripslashes($_POST['test']));

Is this behavior expected in Wordpress?

I'm new to wordpress development.

I'm trying to develop a simple plugin for practice. It involves a form submission from the frontend. The form has an input with the following code.

<input type='hidden' name='test' value='{"id": 1}'/>

When I submit the form, the value of 'test' field gets altered after the "init" hook.

My plugin code looks like the following

add_action('init', [$this, 'init']);

function init() {
    printe_r($_POST);
}

Output:

Array
(
    [test] => {\"id\":1}
)

The problem is that json_decode errors out. I have to use stripslashes like below to decode the json string.

json_decode(stripslashes($_POST['test']));

Is this behavior expected in Wordpress?

• plugins
• input

Share Improve this question asked Jun 27, 2020 at 11:39 왕뚜껑왕뚜껑 6511 silver badge33 bronze badges

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2 Answers 2

Sorted by: Reset to default 0

Yes, it's the expected behaviour. There's information on why it works like this here, and this function which can help in removing slashes from larger data structures: https://developer.wordpress/reference/functions/stripslashes_deep/

In the short term, if you can live without JSON for this field, why not just remove it, and if you need multiple hidden fields add them separately, e.g.:

<input type='hidden' name='testId' value='1'/>
<input type='hidden' name='otherId' value='123'/>

And you can get those directly with:

echo $_POST['testId'];
echo $_POST['otherId'];

Will output:

1
123

As @mozboz explained, WordPress is changing the values of $_POST, $_GET, $_REQUEST, and $_COOKIE. If you need the raw values, use the function filter_input(), and make sure to keep security concerns in mind.

Example:

$test = filter_input( INPUT_POST, 'test', FILTER_SANITIZE_STRING );

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