如何发送和接收动态输入字段的MySQL数据

I was wondering how someone would send and receive input data to and from a MySQL database when the form that is being submitted can have additional fields added to it (So one order form might have 10 input fields and another might have 30). Here is a snippet to give you an idea of what I am talking about - http://jsfiddle.net/gv0029/M84r7/

I saw an post about using arrays but it was from 4 years ago and am wanting to make sure whatever I do is still using best practices. Any and all help or ideas would be greatly appreciated! Thank you!

HTML:

<fieldset id="fence">
    <div name="inputFence" class="inputFence">
        <legend><strong>Fence Description</strong>
        </legend>
        <label>Footage:
            <input name="footage_1" class="footage" />
        </label>
        <label>Fence Height</label>
        <select name="fenceHeight_1" class="fenceHeight">
            <option value="select">Select Fence Height</option>
            <option value="6" id="fH6">6 Ft.</option>
            <option value="8" id="fH8">8 Ft.</option>
        </select>
        <legend><strong>Post Type</strong>
        </legend>
        <label>Post Quantity:
            <input name="postQuantity_1" class="postQuantity" />
        </label>
        <label>Picket Quantity
            <input name="picketQuantity_1" class="picketQuantity" />
        </label>
</fieldset>
<div>
    <input type="button" id="btnAddFence" value="Add Another Fence" />
    <input type="button" id="btnDelFence" value="Remove Fence" />
</div>
</form>

JS

//Dynamic Fence Input Fields
$('#btnAddFence').click(function () {

    // create the new element via clone()
    var newElem = $('.inputFence:last').clone();

    // insert the new element after the last "duplicable" input field
    $('.inputFence:last').after(newElem);

    // enable the "remove" button
    $('#btnDelFence').removeAttr('disabled');

    //get the input name and split into array (assuming your clone is always last)
    var parts = $('.fenceHeight:last').attr('name').split("_");
    //change the second element of the array to be one higher
    parts[1]++;
    //join back into a string and apply to the new element
    $('.fenceHeight:last').attr('name', parts.join("_"));

    //do the same for other two inputs
    parts = $('.postQuantity:last').attr('name').split("_");
    parts[1]++;
    $('.postQuantity:last').attr('name', parts.join("_"));

    parts = $('.footage:last').attr('name').split("_");
    parts[1]++;
    $('.footage:last').attr('name', parts.join("_"));

    parts = $('.6foc:last').attr('name').split("_");
    parts[1]++;
    $('.6foc:last').attr('name', parts.join("_"));

    parts = $('.railQuantity:last').attr('name').split("_");
    parts[1]++;
    $('.railQuantity:last').attr('name', parts.join("_"));

});

$('#btnDelFence').click(function () {
    //remove the last inputFence
    $('.inputFence:last').remove();

    // if only one element remains, disable the "remove" button
    if ($('.inputFence').length == 1) $('#btnDelFence').attr('disabled', 'disabled');
});

$('#btnDelFence').attr('disabled', 'disabled');