Show "Premium" next to the title tag for posts in Paid Memberships Pro.

show-premium-tag-pmpro-post-titles.php

<?php
/**
 * Append a "Premium" badge to post titles on archive/blog/search pages
 * when the post requires a PMPro membership level.
 */
function my_pmpro_premium_badge_on_title( $title, $post_id = null ) {
	if ( is_singular() || is_admin() ) {
		return $title;
	}

	if ( ! function_exists( 'pmpro_has_membership_access' ) ) {
		return $title;
	}

	$post_levels = pmpro_has_membership_access( $post_id, null, true );

	// pmpro_has_membership_access returns [ bool $hasaccess, array $post_levels, array $user_levels ]
	// We want to show the badge when the post has *any* required level (regardless of current user access).
	if ( empty( $post_levels[1] ) ) {
		return $title;
	}

	$badge = '<span class="pmpro-premium-badge" aria-label="' . esc_attr__( 'Members only', 'paid-memberships-pro' ) . '">'
		. '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false" fill="currentColor" width="1em" height="1em"><path d="M12 1L9 9H2l6 4.5L5.5 21 12 17l6.5 4L16 13.5 22 9h-7z"/></svg>'
		. esc_html__( 'Premium', 'paid-memberships-pro' )
		. '</span>';

	return $title . ' ' . $badge;
}
add_filter( 'the_title', 'my_pmpro_premium_badge_on_title', 10, 2 );

/**
 * Styles for the premium badge.
 */
function my_pmpro_premium_badge_styles() {
	if ( is_singular() || is_admin() ) {
		return;
	}
	?>
	<style>
	.pmpro-premium-badge {
		display: inline-flex;
		align-items: center;
		gap: 0.25em;
		font-size: 0.6em;
		font-weight: 600;
		letter-spacing: 0.05em;
		text-transform: uppercase;
		color: #fff;
		background: #b8860b;
		border-radius: 3px;
		padding: 0.2em 0.5em;
		vertical-align: middle;
		line-height: 1.4;
		white-space: nowrap;
	}
	.pmpro-premium-badge svg {
		flex-shrink: 0;
	}
	</style>
	<?php
}
add_action( 'wp_head', 'my_pmpro_premium_badge_styles' );