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Id
6225547
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0
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0
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0
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CreationDate
2011-06-03T09:54:52.140
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2011-06-03T11:24:11.197
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2011-06-03T11:24:11.197
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782481
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782481
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1249931
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2
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3
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text
Body
<p>PHP filters: Handling optional values / optional form inputs with filter_input_array() filter function.</p> <p>I'll demonstrate a simple way of how to handle optional fields or form inputs when working with PHP filters. The rule of thumb is:</p> <ol> <li>Filter ALL form inputs, required & optional. Don't leave out optional fields in your filter.</li> <li>Use the === comparison operator to differentiate between FALSE, NULL, "" and 0 values</li> </ol> <p>Sample code for a simple contact form with 4 required and 4 optional inputs is shown below</p> <pre><code><?php if ($_SERVER["REQUEST_METHOD"] == "POST"){ /*set validation control variable*/ $input_error_flag = true; /*set form input validation filters*/ $form_filter = array( 'first_name' => FILTER_SANITIZE_STRING, 'middle_name' => FILTER_SANITIZE_STRING, 'last_name' => FILTER_SANITIZE_STRING, 'email_address' => FILTER_SANITIZE_EMAIL, 'postal_address' => FILTER_SANITIZE_NUMBER_INT, 'street_address' => FILTER_SANITIZE_STRING, 'telephone_number' => FILTER_SANITIZE_NUMBER_INT, 'mobile_number' => FILTER_SANITIZE_NUMBER_INT, ); /*list optional fields or optional form inputs in array*/ $optional_fields = array( 'middle_name' => "", 'postal_address' => "", 'street_address' => "", 'mobile_number' => "", ); /*set error display message of each required element*/ $error_description = array( 'first_name' =>"Missing or incorrect First Name", 'last_name' =>"Missing or incorrect Last Name", 'email_address' =>"Missing or incorrect Email Address", 'telephone_number' =>"Missing or incorrect Telephone Number", ); /*sanitize all form inputs against form_filter*/ $form_data = filter_input_array(INPUT_POST, $form_filter); /*check form inputs for filter validation errors*/ foreach ($form_data as $form_input => $value){ /*check if filter failed (false), input not defined (null) or input missing ("") * and insert name of form input element into $invalid_array for error display */ if($value === FALSE || $value === NULL || $value == ""){ /*exclude error display for optional items with empty values*/ if(!(array_key_exists($form_input, $optional_fields) && $value == "")){ $invalid_inputs[] = $form_input; } } } /*unset filter validation control variable if no errors*/ if(empty ($invalid_inputs)) $input_error_flag = false; /*your calls to SQL functions for INSERT or UPDATE statements go here*/ if(!$input_error_flag){ functionname::getInstance()->insert_contact_details($form_data); } } ?> </code></pre> <p>And finally the html form with the error display section</p> <pre><code><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <form action="sample.php" method="POST" id="sample"> <label for="first_name">First Name*</label> <input type="text" name="first_name" id="first_name" value="<?php echo $form_data['first_name']; ?>"/><br/> <label for="middle_name">Middle Name</label> <input type="text" name="middle_name" id="middle_name" value="<?php echo $form_data['middle_name']; ?>"/><br/> <label for="last_name">Last Name*</label> <input type="text" name="last_name" id="last_name" value="<?php echo $form_data['last_name']; ?>"/><br/> <label for="email_address">Email Address*</label> <input type="text" name="email_address" id="email_address" value="<?php echo $form_data['email_address']; ?>"/><br/> <label for="postal_address">Postal Address</label> <input type="text" name="postal_address" id="postal_address" value="<?php echo $form_data['postal_address']; ?>"/><br/> <label for="street_address">Street Address</label> <input type="text" name="street_address" id="street_address" value="<?php echo $form_data['street_address']; ?>"/><br/> <label for="telephone_number">Telephone Number*</label> <input type="text" name="telephone_number" id="telephone_number" value="<?php echo $form_data['telephone_number']; ?>"/><br/> <label for="mobile_number">Mobile Number</label> <input type="text" name="mobile_number" id="mobile_number" value="<?php echo $form_data['mobile_number']; ?>"/><br/> <input type="submit" name="submit" value="submit"><br/> <?php //display input validation errors on your html form if ($input_error_flag){ foreach($invalid_inputs as $key => $form_input){ if(array_key_exists($form_input, $error_description)){ echo $error_description[$form_input]."<br/>"; } } } ?> </form> </body> </html> </code></pre>
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