php - POST an array from an HTML form without javascript

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I have a form that is a little complex and I am hoping to simplify the server-side (PHP) processing by natively POSTing an array of tuples.

The first part of the form represents a User :

First Name

Last Name

Address

The second part of the form represents a Tree :

Fruit

Height

The problem is that I need to be able to POST multiple Trees for a single User in the same form. I would like to send the information as a single User with an array of Trees but this might be too complex to do with a form. The only thing that comes to mind is using javascript to create some JSON message with a User object and an array of Tree objects. But it would be nice to avoid javascript to support more users (some people have scripts turned off).

Does the array guarantee order? I would like an array of Tree objects which would have multiple fields, so this would mean I have to use multiple arrays to represent a Tree and the arrays must be ordered so I can figure out which Tree they represent. – styfle Jan 31, 2012 at 2:44

<input type="text" name="firstname">
<input type="text" name="lastname">
<input type="text" name="email">
<input type="text" name="address">
<input type="text" name="tree[tree1][fruit]">
<input type="text" name="tree[tree1][height]">
<input type="text" name="tree[tree2][fruit]">
<input type="text" name="tree[tree2][height]">
<input type="text" name="tree[tree3][fruit]">
<input type="text" name="tree[tree3][height]">
it should end up like this in the $_POST[] array (PHP format for easy visualization)
$_POST[] = array(
    'firstname'=>'value',
    'lastname'=>'value',
    'email'=>'value',
    'address'=>'value',
    'tree' => array(
        'tree1'=>array(
            'fruit'=>'value',
            'height'=>'value'
        'tree2'=>array(
            'fruit'=>'value',
            'height'=>'value'
        'tree3'=>array(
            'fruit'=>'value',
            'height'=>'value'
                What chars are allowed in array indexing? Can we use ,.:` @? Example: tree[tree 1][fr ui_t] tree[tree.1][fru:it] tree[tree@1][fru,it]  Is _ only safe delimiter in key naming?
– CoR
                Jun 17, 2014 at 18:53
                How do i get this submitted data as array/object in js to use in submit callback... i have tried new formData($("form")[0]) and jQuery $("form").serializeArray() both returning name="tree[tree1][fruit]" as string....help
– santoshe61
                Mar 16, 2020 at 10:08
                Note: it doesn't work with jquery functions to collect form data as .serialize() or .serializeArray()
– SubjectDelta
                Mar 18, 2020 at 11:48
You can also post multiple inputs with the same name and have them save into an array by adding empty square brackets to the input name like this:
<input type="text" name="comment[]" value="comment1"/>
<input type="text" name="comment[]" value="comment2"/>
<input type="text" name="comment[]" value="comment3"/>
<input type="text" name="comment[]" value="comment4"/>
If you use php:
print_r($_POST['comment']) 
you will get this:
Array ( [0] => 'comment1' [1] => 'comment2' [2] => 'comment3' [3] => 'comment4' )