Form Submission

The "name" attribute

The name attribute in a form is the key of the data submitted to the server with the request (and the value the value).

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When we must submit multiple values with the same key we name each input field with square brackets []:

<input type="hidden" name="ingredients[]" value="5">
<input type="hidden" name="ingredients[]" value="9">

It tells the browser:

“When the form is submitted, collect all inputs with the same name (ingredients[]) into an array and send that array to the server.”

In PHP this becomes:

$_POST['ingredients'] = [5, 9];