Copy post meta for the given key from one post to another.

Parameters

$source_post_idintrequired

Post ID to copy meta value(s) from.

$target_post_idintrequired

Post ID to copy meta value(s) to.

$meta_keystringrequired

Meta key to copy.

Source

function _wp_copy_post_meta( $source_post_id, $target_post_id, $meta_key ) {

	foreach ( get_post_meta( $source_post_id, $meta_key ) as $meta_value ) {
		/**
		 * We use add_metadata() function vs add_post_meta() here
		 * to allow for a revision post target OR regular post.
		 */
		add_metadata( 'post', $target_post_id, $meta_key, wp_slash( $meta_value ) );
	}
}

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