Paid Memberships Pro Renew Membership Shortcode - with options to show within so many days of renewal

pmpro-renew-membership-shortcode.php

<?php
/**
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 * The my_pmpro_renew_membership_shortcode is a custom function creating a renew link for members.
 * Use the shortcode [pmpro_renew_button] to display the button anywhere on your site where shortcodes are recognized.
 *
 * @return string A link containing the URL string to renew.
 */
 


function my_pmpro_renew_membership_shortcode() {
	global $current_user, $pmpro_pages;
	// Current user empty (i.e. not logged in)
	if ( empty( $current_user ) ) {
		return;
	}
	
	$level = pmpro_getMembershipLevelForUser( $current_user->ID );
	// If the user does not have a membership level, don't display anything.
	if( empty( $level ) ) {
		return;
	}
	if ( empty( $level->enddate ) ) {
	return;
	}

	$days = 15; // Change this to value.

	// Are we within the days until expiration?
	$now = current_time( 'timestamp' );

	if ( $now + ( $days * 3600 * 24 ) < $level->enddate ) {
		return;
	}
	
	// CSS Styling that changes link into a button.
	?>
		<style>
			a.pmpro-renew-button {
				background-color: #4CAF50;
				border: none;
				color: #fff;
				padding: 15px 32px;
				text-align: center;
				text-decoration: none;
				display: inline-block;
				font-size: 16px; 
			}
		</style>
	<?php
	
	$level_id = $level->id;
	$url = add_query_arg( 'level', $level_id, get_permalink( $pmpro_pages['checkout'] ) );
	return '<a class="pmpro-renew-button" href="' . esc_url( $url ) . '">Renew Membership</a>';
	
}
add_shortcode( 'pmpro_renew_button', 'my_pmpro_renew_membership_shortcode' );