README

PHP utility classes to implement general contact form (also with confirmation view). It's maybe useful to build contact form on WordPress or pure PHP site.

Requirements

PHP 5.4+
Configuring date.timezone in php.ini

Supported features

Csrf protection with session and hidden input tag
Server side validation for submitted values
Short hands to print submitted value itself, validation errors, "selected" option, "checked" option
Attaching files and handle them easily in the same session
Sending email which contains submissions information easily

Installation

$ composer require ttskch/contact-form

$ git clone git@github.com:ttskch/contact-form.git
$ cd contact-form
$ composer install --no-dev

# If your web site is not composer-friendly, upload whole "contact-form" directory by hand.

Usage

<?php
// index.php

require_once '/path/to/contact-form/vendor/autoload.php';

$cf = new \Ttskch\ContactForm\ContactForm();

// validation targets ("required" and "email" are supported)
$requiredKeys = ['Name', 'Email'];
$emailKeys = ['Email'];

// after posted, validate csrf and submissions and redirect to next page
$cf->validateAndRedirectAfterSelfPosted('./confirm.php', $requiredKeys, $emailKeys);
?>

<!-- post to self -->
<form action="" method="post">
    
    <!-- put hidden input tag for csrf token -->
    <?= $cf->csrfHiddenInput(); ?>

    <!-- text field with submitted value if exists -->
    <input type="text" name="Name" value="<?= $cf->present('Name'); ?>" required autofocus>
    <!-- show error if exists -->
    <p><?= $cf->presentError('Name'); ?></p>
    
    <!-- text field with submitted value if exists -->
    <input type="email" name="Email" value="<?= $cf->present('Email'); ?>" required>
    <!-- show error if exists -->
    <p><?= $cf->presentError('Email'); ?></p>
    
    <!-- selector field with selection submitted or default option -->
    <select class="form-control" name="Gender">
        <option value="Male" <?= $cf->presentSelected('Gender', 'Male', $default = true); ?>>Male</option>
        <option value="Female" <?= $cf->presentSelected('Gender', 'Female'); ?>>Female</option>
        <option value="Other" <?= $cf->presentSelected('Gender', 'Other'); ?>>Other</option>
    </select>

    <button type="submit">Confirm</button>
</form>

<?php
// confirm.php

require_once '/path/to/contact-form/vendor/autoload.php';

$cf = new \Ttskch\ContactForm\ContactForm();

// redirect to top page if requested without submissions
$cf->rejectAccessWithoutSubmissions('./index.php');

// after posted, validate csrf and redirect to next page
$cf->validateAndRedirectAfterSelfPosted('./thanks.php');
?>

<!-- post to self -->
<form action="" method="post">

    <!-- put hidden input tag for csrf token -->
    <?= $cf->csrfHiddenInput(); ?>
    
    <!-- show submitted values -->
    <p><?= $cf->present('Name'); ?></p>
    <p><?= $cf->present('Email'); ?></p>
    <p><?= $cf->present('Gender'); ?></p>

    <button type="submit">Send</button>
    
    <!-- can back to index.php and re-edit inputs -->
    <a href="javascript:history.back();">Back</a>

</form>

<?php
// thanks.php

require_once '/path/to/contact-form/vendor/autoload.php';

$cf = new \Ttskch\ContactForm\ContactForm();

// redirect to top page if requested without submissions
$cf->rejectAccessWithoutSubmissions('./index.php');

$template = <<<EOT
----------------------------------------------------------------------
Name: %s
----------------------------------------------------------------------
Email: %s
----------------------------------------------------------------------
Gender: %s
----------------------------------------------------------------------
EOT;

$body = vsprintf($template, [
    $cf->present('Name', false),
    $cf->present('Email', false),
    $cf->present('Gender', false),
]);

$cf->sendEmail(
    'you@email.com',  // to
    'from@email.com', // from
    'Your Name',      // from name
    'Got inquiry',    // subject
    $body             // body
);

// clear submissions after sending email
// by this, if users reload thanks.php after sending email they will be redirected to index.php 
$cf->clearSubmissions();
?>

<p>Form is successfully submitted!</p>

See demo code or run it on your local to learn more :)

Precaution

Because this utility calls header() function to redirect, you must execute instantiation and some methods before any actual output is sent.

ttskch / contact-form

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