Custom contact form shortcode - used for custom product enquiry on WooCommerce

functions.php

/**
 *
 * Shortcode contact form 
 */
// @codingStandardsIgnoreStart
function decorativefair_shortcode_product_form($item) {
 ob_start();
	
 global $post, $product;	
 $author_name = get_the_author_meta( 'user_email', $product->post->post_author );	
 $producttitle = get_the_title($item['id']);
   
if(isset($_POST['submitted'])) {
	if(trim($_POST['contactName']) === '') {
		$nameError = 'Please enter your name.';
		$hasError = true;
	} else {
		$name = trim($_POST['contactName']);
	}

	if(trim($_POST['email']) === '')  {
		$emailError = 'Please enter your email address.';
		$hasError = true;
	} else if (!preg_match("/^[[:alnum:]][a-z0-9_.-]*@[a-z0-9.-]+\.[a-z]{2,4}$/i", trim($_POST['email']))) {
		$emailError = 'You entered an invalid email address.';
		$hasError = true;
	} else {
		$email = trim($_POST['email']);
	}
	
    if(trim($_POST['phone']) === '') {
		$phoneError = 'Please enter your phone.';
		$hasError = true;
	} else {
		$phone = trim($_POST['phone']);
	}

	if(trim($_POST['comments']) === '') {
		$commentError = 'Please enter a message.';
		$hasError = true;
	} else {
		if(function_exists('stripslashes')) {
			$comments = stripslashes(trim($_POST['comments']));
		} else {
			$comments = trim($_POST['comments']);
		}
	}
	

	if(!isset($hasError)) {
		$emailTo = get_option('tz_email');
		if (!isset($emailTo) || ($emailTo == '') ){
			$emailTo = $author_name;
		}
	
		
		$subject = 'Decorative Fair Website - Product name: '.$producttitle;
		//$body = "Name: $name \n\nEmail: $email \n\nComments: $comments";

		$body .= "Name: " . $name . "\n";
		$body .= "Email: " . $email . "\n";
		$body .= "Enquire: " . $comments . "\n";
		$body .= "Product: " . $producttitle . "\n";


		$headers = 'From: '.$name.' <'.$emailTo.'>' . "\r\n" . 'Reply-To: ' . $email;

		$headers = [
			//'Content-Type: text/html; charset=UTF-8',
			'Cc: Decorative Fair Team <[email protected]>',
		];		


		wp_mail($emailTo, $subject, $body, $headers);
		$emailSent = true;
	}

} 

?>
			
<div class="product-contact-form-container">
	<?php if(isset($emailSent) && $emailSent == true) { ?>
		<div class="thanks">
			<p>Thank you, your enquire was sent successfully.</p>
		</div>
	<?php } else { ?>

		<?php if(isset($hasError) || isset($captchaError)) { ?>
			<p class="error">Sorry, an error occured.<p>
		<?php } ?>

	<form action="<?php the_permalink(); ?>" id="contactForm" method="post">
		<div class="product-contact-form">
		<div class="product-form-name">
			<label class="form-label" for="contactName">Your name*</label>
			<input type="text" name="contactName" id="contactName" value="<?php if(isset($_POST['contactName'])) echo $_POST['contactName'];?>" class="required requiredField" />
			<?php if($nameError != '') { ?>
				<span class="error"><?php echo $nameError; ?></span>
			<?php } ?>
		</div>

		<div class="product-form-email">
			<label class="form-label" for="email">Your email address*</label>
			<input type="text" name="email" id="email" value="<?php if(isset($_POST['email']))  echo $_POST['email'];?>" class="required requiredField email" />
			<?php if($emailError != '') { ?>
				<span class="error"><?php echo $emailError; ?></span>
			<?php } ?>
		</div>


		<div class="product-form-telefone">
			<label class="form-label" for="phone">Your phone number*</label>
			<input type="tel" id="phone" name="phone" value="<?php if(isset($_POST['phone']))  echo $_POST['phone'];?>" class="required requiredField phone" pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}">								
			<?php if($phoneError != '') { ?>
				<span class="error"><?php echo $phoneError; ?></span>
			<?php } ?>
		</div>

		<div class="product-form-message">
			<label class="form-label" for="commentsText">Your message</label>
			<textarea name="comments" id="commentsText" rows="10" cols="10" class="required requiredField"><?php if(isset($_POST['comments'])) { if(function_exists('stripslashes')) { echo stripslashes($_POST['comments']); } else { echo $_POST['comments']; } } ?></textarea>
			<?php if($commentError != '') { ?>
				<span class="error"><?php echo $commentError; ?></span>
			<?php } ?>
		</div>
		<div class="product-form-privacy">
			<p class="product-form-privacy-text"> By clicking contact dealer, you accept our Privacy Policy.</p>	
		</div>
		<div class="product-form-submit">
			<input class="product-form-submit-btn" type="submit" value="CONTACT DEALER">		
		</div>
	</div>
	<input type="hidden" name="submitted" id="submitted" value="true" />
</form>
<?php } ?>
</div>
		

<?php
 return ob_get_clean();
}
add_shortcode( 'productform', 'decorativefair_shortcode_product_form' );
// @codingStandardsIgnoreEnd