Displaying error messages with the form : Form Validation « Form « PHP






  1. PHP
  2. Form
  3. Form Validation

Displaying error messages with the form

 
<?
if ($_POST['_submit_check']) {
    if ($form_errors = validate_form()) {
        show_form($form_errors);
    } else {
        process_form();
    }
} else {
    show_form();
}

function process_form() {
    print "Hello, ". $_POST['my_name'];
}

function show_form($errors = '') {
    if ($errors) {
        print 'Please correct these errors: <ul><li>';
        print implode('</li><li>', $errors);
        print '</li></ul>';
    }

    print<<<_HTML_
<form method="POST" action="$_SERVER[PHP_SELF]">
Your name: <input type="text" name="my_name">
<br/>
<input type="submit" value="Say Hello">
<input type="hidden" name="_submit_check" value="1">
</form>
_HTML_;
}

function validate_form() {
    $errors = array();

    if (strlen($_POST['my_name']) < 3) {
        $errors[] = 'Your name must be at least 3 letters long.';
    }
    return $errors;
}
?>








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