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}

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/**

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* Updates the last-used postmeta on a header image attachment after saving a new header image via the Customizer.

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* @since 3.9.0

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* @param WP_Customize_Manager $wp_customize Customize manager.

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public function customize_set_last_used( $wp_customize ) {

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$header_image_data_setting = $wp_customize->get_setting( 'header_image_data' );

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if ( ! $header_image_data_setting ) {

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return;

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}

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$data = $header_image_data_setting->post_value();

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if ( ! isset( $data['attachment_id'] ) ) {

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return;

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}

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$attachment_id = $data['attachment_id'];

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$key = '_wp_attachment_custom_header_last_used_' . get_stylesheet();

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update_post_meta( $attachment_id, $key, time() );

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}

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/**

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* Gets the details of default header images if defined.

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* @since 3.9.0

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* @return array Default header images.

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public function get_default_header_images() {

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$this->process_default_headers();

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// Get the default image if there is one.

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$default = get_theme_support( 'custom-header', 'default-image' );

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if ( ! $default ) { // If not, easy peasy.

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return $this->default_headers;

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}

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$default = sprintf( $default, get_template_directory_uri(), get_stylesheet_directory_uri() );

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$already_has_default = false;

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foreach ( $this->default_headers as $k => $h ) {

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if ( $h['url'] === $default ) {

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$already_has_default = true;

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break;

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}

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}

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if ( $already_has_default ) {

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return $this->default_headers;

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}

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// If the one true image isn't included in the default set, prepend it.

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$header_images = array();

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$header_images['default'] = array(

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'url' => $default,

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'thumbnail_url' => $default,

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'description' => 'Default',

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);

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// The rest of the set comes after.

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return array_merge( $header_images, $this->default_headers );

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}

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/**

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* Gets the previously uploaded header images.

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* @since 3.9.0

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* @return array Uploaded header images.

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public function get_uploaded_header_images() {

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$header_images = get_uploaded_header_images();

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$timestamp_key = '_wp_attachment_custom_header_last_used_' . get_stylesheet();

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$alt_text_key = '_wp_attachment_image_alt';

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foreach ( $header_images as &$header_image ) {

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$header_meta = get_post_meta( $header_image['attachment_id'] );

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$header_image['timestamp'] = isset( $header_meta[ $timestamp_key ] ) ? $header_meta[ $timestamp_key ] : '';

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$header_image['alt_text'] = isset( $header_meta[ $alt_text_key ] ) ? $header_meta[ $alt_text_key ] : '';

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}

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return $header_images;

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}

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/**

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* Gets the ID of a previous crop from the same base image.

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* @since 4.9.0

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* @param array $attachment An array with a cropped attachment object data.

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* @return int|false An attachment ID if one exists. False if none.

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public function get_previous_crop( $attachment ) {

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$header_images = $this->get_uploaded_header_images();

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// Bail early if there are no header images.

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if ( empty( $header_images ) ) {

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return false;

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}

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$previous = false;

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foreach ( $header_images as $image ) {

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if ( $image['attachment_parent'] === $attachment['post_parent'] ) {

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$previous = $image['attachment_id'];

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break;

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}

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}

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return $previous;

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}

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}

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