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Add Image to Sitemap From an Image ACF Field

This filter can be used to add an image from an Image ACF field with the "custom_image" key.

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php
<?php
add_filter( 'aioseo_sitemap_images', 'aioseo_filter_sitemap_images', 10, 2 );
function aioseo_filter_sitemap_images( $images, $post ) {
	if ( ! function_exists( 'get_field' ) ) {
		return $images;
	}
	$customImage = get_field( 'custom_image', $post->ID );
	if ( ! empty( $customImage ) ) {
		$images[] = wp_get_attachment_image_url( $customImage['id'] );
	}
	return $images;
}

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