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December 14, 2015 00:29
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Validate a form using php.
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<?php | |
session_start(); | |
header("Content-Type: text/html"); | |
$errors = array(); | |
// Reset form. | |
if(array_key_exists('clearForm', $_POST)) | |
{ | |
unset($_SESSION); | |
$_SESSION = array(); | |
header("Location: form.php"); | |
} | |
// Field refers to form fields of the form.php page. | |
$field = array( | |
'month' => 'expiryMonth', | |
'year' => 'expiryYear', | |
'cc_type' => 'cardType', | |
'cc_num' => 'cardNumber', | |
'email' => 'emailAddress' | |
); | |
// Set validators and messages. | |
$validators = array( | |
$field['month'] => function($key){ return $_POST[$key] != "--"; }, | |
$field['year'] => function($key){ return $_POST[$key] != "----"; }, | |
$field['cc_type'] => function($key){ return $_POST[$key] != "notSelected"; }, | |
$field['cc_num'] => function($key){ return true; /* need to put regex here */ }, | |
$field['email'] => function($key){ return true; /* need to put regex here */ }, | |
); | |
$messages = array( | |
$field['month'] => "Please select an expiry month", | |
$field['year'] => "Please select an expiry year", | |
$field['cc_type'] => "Please select a credit card type", | |
$field['cc_num'] => "Please enter a valid card number", | |
$field['email'] => "Please entar a valid email address" | |
); | |
// Validate the form given the validators, messages and an errors array to populate. | |
validate_form($validators, $messages, $errors); | |
foreach($errors as $key => $err) | |
{ | |
echo "$key: $err<br/>"; | |
} | |
//=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- | |
function validate_form(&$validators, &$messages, &$errs) | |
{ | |
foreach($validators as $key => $func) | |
{ | |
validate_field($key, $func, $errs, $messages[$key]); | |
} | |
} | |
function validate_field($key, &$validation_function, &$err_array, $err_msg) | |
{ | |
if(!(array_key_exists($key, $_POST) && $validation_function($key) )) | |
$err_array[$key] = $err_msg; | |
} | |
?> |
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I think this woud be nicer... default compiler won't catch errors but there are probably tools that can sniff out possible errors anyway if you do it this way:
$month = "expiryMonth";
$year = "expiryYear";
$cc_type = "cardType";
$cc_num = "cardNumber";
$email = "emailAddress";
$fields = array( $month, $year, $cc_type, $cc_num, $email);