How to Submit Multidimensional Arrays via POST in PHP?

Submitting Multidimensional Arrays via POST in PHP

Context

A multidimensional array is a data structure that organizes data into multiple dimensions. In the case of a form, each row and column represents a dimension. The challenge presented in this discussion is to create a multidimensional array from an unknown number of rows and known number of columns in a PHP form.

Solution

The proposed solution involves using a form with input fields named in a specific format:

<input name="diameters[0][top]" type="text">

This format creates a nested array structure where each row is an element of the outer array, and the top and bottom diameter values are stored as elements of the inner array.

Upon form submission, the $_POST array will contain the multidimensional array in the following format:

$_POST['diameters'] = array(
    array(
        'top' => 'first value',
        'bottom' => 'first value'
    ),
    array(
        'top' => 'second value',
        'bottom' => 'second value'
    )
);

Example Usage

To display the array as a table, you can use the following code:

if ( isset( $_POST['diameters'] ) )
{
    echo '<table>';
    foreach ( $_POST['diameters'] as $diam )
    {
        echo '<tr>';
        echo '  <td>', $diam['top'], '</td>';
        echo '  <td>', $diam['bottom'], '</td>';
        echo '</tr>';
    }
    echo '</table>';
}

This code will generate a simple table with two columns: "Top" and "Bottom" that displays the data from the submitted form.

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