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<?php

function ccd_custom_content_loop() {
	ob_start();

	if ( have_rows( 'repeater_field_name' ) ) :
		echo '<ul class="slides">';
			while ( have_rows( 'repeater_field_name' ) ) : the_row(); 
			// vars
			$image = get_sub_field( 'image' );
			$content = get_sub_field( 'content' );
			$link = get_sub_field( 'link' );

			echo '<li class="slide">';
				if ( $link ) :
					echo '<a href="' . $link . '">';
				endif;
					echo '<img src="' . $image['url'] . 'alt="' . $image['alt'] . '" />';
				if ( $link ) :
					echo '</a>';
				endif;
				echo $content;
			echo '</li>';
		endwhile;
		echo '</ul>';
	endif;

	return ob_get_clean();
}

function ccd_custom_content_filter( $content ) {
	$custom_content = ccd_custom_content_loop();
	
	if ( is_singular( 'my-cpt' ) && in_the_loop() && is_main_query() ) {
        return $custom_content;
    }
    return $content;
}

?>