Question

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Using square brackets in hidden HTML input fields

What can I do with brackets in the name attribute of input element?
This is tutorial:

<input id="user_email" name="user[email]" size="30" tabindex="1" type="text">

Answer 1

They have no particular meaning in HTML. Some server-side frameworks, including PHP, use that sort of notation as an indication that they should build up the data in a single server-side object (an associative array in PHP’s case). So with PHP, for instance, if you had name="user[email]" and name="user[phone]" and submitted the form, in your PHP code on the server you’d retrieve a single user object from the request and it would have the keys email and phone on it. Or if you had name="tags[]" on multiple inputs, PHP would build an array with all of the values called tags on the request object.