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Create use-acf-field-as-fallback-for-excerpt.txt

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Execute a function on a child site/Advanced Custom Fields
- use-acf-field-as-fallback-for-excerpt.txt

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	`1`	`+add_filter( 'get_the_excerpt', function ( $excerpt, $post ) {`
	`2`	`+ if ( ! empty( $excerpt ) ) {`
	`3`	`+ return $excerpt;`
	`4`	`+ }`
	`5`	`+`
	`6`	`+ // On a specific post type, use an ACF field value as the excerpt.`
	`7`	`+ if ( $post->post_type === 'my_custom_post_type' ) {`
	`8`	`+ $excerpt = get_field( 'product_description', $post->ID );`
	`9`	`+ }`
	`10`	`+`
	`11`	`+ return $excerpt;`
	`12`	`+}, 10, 2 );`

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