A simple contact form WordPress plugin. Visit https://www.davidangulo.xyz/ for more information.

contact.php

<?php
/*
Plugin Name: Simple Contact Form
Plugin URI: https://www.davidangulo.xyz/portfolio/
Description: A very simple contact form.
Version: 1.0.0
Author: David Angulo
Author URI: https://www.davidangulo.xyz/
License: GPL2
*/


add_shortcode("simple_contact_form","myContactFormRender");
function myContactFormRender() {
    ob_start();
    myContactForm();
    return ob_get_clean();
}

function myContactForm() {
    if(isset($_POST["scf-submit"])) {
    	$name = $_POST["scf-name"];
    	$email = $_POST["scf-email"];
    	$subject = $_POST["scf-subject"];
    	$message = $_POST["scf-message"];

    	$to = get_option("admin_email");
    	$headers = "From: $name <$email>" . "\r\n";

    	if(wp_mail($to,$subject,$message,$headers)) {
    		echo "<script>Your message has been sent successfully.</script>";
    	}
    	else {
    		echo "<script>An error has occured. </script>";
    	}
    }
    ?>
    	<style>
    		.form-control {
    			width: 100%;
    			margin-bottom: 20px;
    		}
    		.pull-right {
    			float: right;
    		}
   		</style>
    	<form action="<?php echo esc_url($_SERVER['REQUEST_URI']);?>" method="post">
    		<label for="scf-name">Name:</label><input type="text" class="form-control" id="scf-name" name="scf-name" required>
    		<label for="scf-email">Email Address:</label><input type="email" class="form-control" id="csf-email" name="scf-email" required>
    		<label for="scf-subject">Subject:</label><input type="text" class="form-control" id="scf-subject" name="scf-subject" required>
    		<label for="scf-message">Message:</label><textarea class="form-control" id="scf-message" name="scf-message" rows="5" required></textarea>
    		<button class="pull-right" type="submit" id="scf-submit" name="scf-submit">Send</button>
    	</form>
    <?php
}


//Visit the tutorial for more information
//https://www.davidangulo.xyz/website-development/how-to-create-a-contact-form-plugin-in-wordpress/