• MisterBlack

• in reply to: Get field key by field name
• August 25, 2016 at 3:12 am

Hi,

I’ve been struggling with this for some time, and this is my solution, I guess it’s not perfect, but is working for me.

function get_acf_field_keys( $custom_field_slug = '' ) {

		$result = array();

		$meta_key_start = 'field_';

		$acf_args = array(
			'post_type'		=> 'acf'
		);

		if ( $custom_field_slug !== '' ) {
			$acf_args[ 'name' ] = $custom_field_slug;
		}

		$acf_query = new WP_Query( $acf_args );

		if ( $acf_query->have_posts() ) {

			while ( $acf_query->have_posts() ) {

				$acf_query->the_post();

				$meta_values = get_post_meta( get_the_id() );

				foreach ( $meta_values as $meta_key => $meta_value ) {
					
					if ( substr( $meta_key, 0, strlen( $meta_key_start ) ) === $meta_key_start ) {

						$meta_value_array = unserialize( $meta_value[0] );

						$result[ $meta_value_array['name'] ] = $meta_key;

					}

				}

			}

		}

		wp_reset_postdata();

		if ( empty( $result ) ) {
			$result = false;
		}

		return $result;

	}

Basically, I’m using WP_Query to iterate through acf posts (Custom fields) & get the metadata, then filter the metadata starting with ‘field_’ to fill an array using the field name as key and the field key as value, to be used like this:

if ( $field_keys = get_acf_field_keys( 'acf_sample-custom-field' ) ) {

		if ( isset( $field_keys[ 'sample_field_name' ] ) ) {
			$sample_field_key = $field_keys[ 'sample_field_name' ];
		}
}

I hope this is helpful for someone.