PHP + JS email obfuscation

simple-encode-email-links--script.php

<?php
// encode email link with rot13
$encoded_email_link = str_rot13( 'mailto:' . strtolower( $email_address ) );
?>

<script>
	// decode rot13-encoded text
	decodeText = text => {
		return text.replace(/[a-z]/gi, letter => {
			return String.fromCharCode(
				letter.charCodeAt(0) +
				(letter.toLowerCase() <= 'm' ? 13 : -13)
			)
		});
	};
	
	// decode and write the email anchor tag to the page
	document.write('<a href=' +
		' "' +
		decodeText( '<?php echo $encoded_email_link; ?>' ) +
		'" ' +
		'title="<?php _e( 'Email', 'mytheme' ); ?>" ' +
		'aria-label="<?php _e( 'Link to email address', 'mytheme' ); ?>">' +
		'<?php _e( 'Email', 'mytheme' ); ?>' +
		'</a>');
</script>