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    <p>Sessions are unnecessary. Your basic plan should be:</p> <ul> <li>Get variables from $_POST()</li> <li>Validate form values.</li> <li>Create an array with the values that passed validation.</li> <li>Use the array to fill the values when redirected to the form.</li> </ul> <p>Before I started using CodeIgniter, I used to use <code>if</code> statements to validate and generate error messages like this:</p> <pre><code>if ( ! empty($_POST['email'])){ if ($this-&gt;verifyInput($_POST['email'], 6)){ $fill['email'] = $_POST['email'];//$fill is the array of values that passed validation } else $tally++;//$tally keeps a running count of the total number of erors } </code></pre> <p>I make a function call to <code>$this-&gt;verifyInput</code> which accepts the field value and the type of validation to perform--in this case it's 6, which indicates email. Here's my validation function:</p> <pre><code>function verifyInput($input, $type){ if ($type == 0) $pattern = '/^1$/';//just the number 1 elseif ($type == 1) $pattern = '/^[0-9]+$/';//just integers elseif ($type == 2) $pattern = '/^[A-Za-zÁ-Úá-úàÀÜü]+$/';//just letters elseif ($type == 3) $pattern = '/^[0-9A-Za-zÁ-Úá-úàÀÜü]+$/';//integers &amp; letters elseif ($type == 4) $pattern = '/^[A-Za-zÁ-Úá-ú0-9àÀÜü\s()\/\'":\*,.;\-!?&amp;#$@]{1,1500}$/';//text elseif ($type == 5) $pattern = '/^[A-Za-zÁ-Úá-úàÀÜü0-9\']+[A-Za-zÁ-Úá-úàÀÜü0-9 \'\-\.]+$/';//name elseif ($type == 6) $pattern = '/^.+@[^\.].*\.[a-z]{2,}$/';//e-mail elseif ($type == 7) $pattern = '/^((\(0?[1-9][0-9]\))|(0?[1-9][0-9]))?[ -.]?([1-9][0-9]{3})[ -.]?([0-9]{4})$/';//brazilian phone if (preg_match($pattern, $input) == 1) return true; else return false; } </code></pre> <p>Once the validation is done, I use the <code>$fill</code> array to prefill the form for each field:</p> <pre><code>&lt;input class="field" type="text" name="email" value = "&lt;?php echo $fill['email']; ?&gt;"/&gt; </code></pre> <p>You should also make sure that <code>$fill</code> is iniciated with empty values such as <code>$fill['email']='';</code> or check to make sure the values are set before filling the input tags:</p> <pre><code>&lt;input class="field" type="text" name="email" value = "&lt;?php if(isset($fill['email'])) echo $fill['email']; ?&gt;"/&gt; </code></pre> <p>These are just general guidelines that you can adapt to your needs, but I found this to be a convenient way to handle it.</p>
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    1. POHow can I re-fill form fields that a user filled out after I've redirected them back to the form when there was an error?
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    1. USUser4407
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    1. POHow can I re-fill form fields that a user filled out after I've redirected them back to the form when there was an error?
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    1. COThat works :) Thanks Pe de Leao! Out of curiosity (because I started learning it this week, and can't really tell how I like it yet) how do you like CodeIgniter VS flat PHP, in particular when it comes to forms & form validation?
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      1. USSamuel Stiles
 

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