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    <p><strong>Server side and Client Side validation :</strong></p> <p>Server side validation is processed in the server. Some data cannot be validated in the client side and it has to be validated in the server side. Eg Date between the two dates in the database.</p> <p>Client side validation is processed the client side before submitting the form. The advantage of using the client side validation is it reduces the network trafic since the validation is processed in the client machine itself. Eg email isnumeric isdate etc.</p> <p>If you want Server side validation (in PHP) you need to write conditions like this:</p> <pre><code>if($_SERVER['REQUEST_METHOD'] == 'POST'){ $error_msg = array(); if(!isset($_POST['your_radio_button_name'])){ $error_msg[] = "Enter the required fields"; } if(!isset($_POST['your_checkbox_button_name'])){ $error_msg[] = "Enter the required fields"; } if(!isset($_POST['your_select_box_name'])){ $error_msg[] = "Enter the required fields"; } if(isset($error_msg) &amp;&amp; count($error_msg) == 0){ // do some form processing } else{ // redirect to the form again. } } </code></pre> <p>Read more about form validation in php:</p> <p><a href="http://phpmaster.com/form-validation-with-php/" rel="nofollow">http://phpmaster.com/form-validation-with-php/</a></p> <p>And if you want client side validation then there are number of options available for it:</p> <p>Check the following article:</p> <p><a href="http://www.jeasyui.com/tutorial/form/form3.php" rel="nofollow">http://www.jeasyui.com/tutorial/form/form3.php</a></p> <p>Hope it'll help you.</p>
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    1. POHow do I make radio buttons, select boxes, and checkboxes required fields in a form?
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    1. COI have no idea what you mean by server and client side validation, I'm pretty new at this. But thank you for the code, i'll apply it right now. However can you tell me the code I would be putting in the //form processing and //redirect parts that you mentioned. I feel like I'm asking stupid questions but I seriously just started working with code a week ago so sorry for my ignorance...
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    2. CO@KacyRaye : Follow the tutorial which I have posted. You will get the idea of it.
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    3. CO@KacyRaye : `do some form processing` part means after successful validation if you want to do some processing like insert form data into the database or redirect some etc. and `redirect to the form again` means if the form is not validated correctly then you can redirect user to you registration page
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