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    <p>The question is looking for to compare the two fields in PHP. Presumably this means that you want to examine them when the form is posted.</p> <p>This means that you'll only have available to you the parts of the field that are sent via the POST -- ie the field <code>name</code> and the <code>value</code>. PHP will never see the <code>id</code> of any of the fields, nor the <code>class</code>, nor any other attributes in the HTML code other than <code>name</code> and <code>value</code>.</p> <p>Therefore the discussion in the comments about whether or not to use <code>id</code> is a somewhat moot point -- even if it is a good point for you to know in general for your HTML code, you can't really use either <code>id</code> or <code>class</code> here anyway because PHP will never see them.</p> <p>You need to take an entirely different approach.</p> <p>[EDITED after question edit]</p> <p>Add the <code>100</code> or <code>200</code>, etc to the <code>value</code> of the <code>image</code> radio buttons, like so:</p> <pre><code>&lt;input type="radio" name="image" value="a_100"/&gt; &lt;input type="radio" name="image" value="b_100"/&gt; &lt;input type="radio" name="image" value="c_100"/&gt; &lt;input type="radio" name="image" value="d_200"/&gt; &lt;input type="radio" name="image" value="e_200"/&gt; &lt;input type="radio" name="image" value="f_300"/&gt; &lt;input type="radio" name="image" value="g_300"/&gt; &lt;input type="radio" name="image" value="h_400"/&gt; </code></pre> <p>(The <code>number</code> radio button set remains unchanged from your question)</p> <p>You can then read it in PHP as follows:</p> <pre><code>$number = $_POST['number']; list($imgNumber, $imgValue) = explode('_',$_POST['image']); </code></pre> <p>You can now compare <code>$number</code> with <code>$imgNumber</code>.</p> <p>Hope that helps.</p> <p>It's worth asking a follow-up question though: What are you trying to achieve here? Is this a validation exersise? ie where you're checking that the user is selecting an <code>image</code> option that matches the <code>number</code> option he's picked? If that's what you're doing, you may find it's more user friendly to use Javascript to filter the options available when they select the <code>number</code> option so that the <code>image</code> radio button set only shows options that are valid for the selected <code>number</code>.</p> <p>This would be an entirely different question, so I won't go into any detail here, but I would suggest that it might be a more user-friendly way of doing things if you did it like that.</p>
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    1. POphp comparison of values in two radio buttons
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    1. CObuddy.. ive updated the question... now check.. and try to solve.. also.. i m ready to answer any question u'd like to... plz have a look
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    2. COokay, so looking at the edits, your best option is to add the `100` or `200` etc to the `value`, as per the second option I gave you. I'll edit the answer to focus on that and how to read it in PHP.
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    3. COedited.... hope that helps.
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