attachment_submitbox_metadata

attachment_submitbox_metadata: 这个函数用来在保存文章编辑界面时保存附件的元数据: 当一个文章被保存时，它会被调用。

在发布元数据框中显示不可编辑的附件元数据。

function attachment_submitbox_metadata() {
	$post          = get_post();
	$attachment_id = $post->ID;

	$file     = get_attached_file( $attachment_id );
	$filename = esc_html( wp_basename( $file ) );

	$media_dims = '';
	$meta       = wp_get_attachment_metadata( $attachment_id );

	if ( isset( $meta['width'], $meta['height'] ) ) {
		$media_dims .= "<span id='media-dims-$attachment_id'>{$meta['width']}&nbsp;&times;&nbsp;{$meta['height']}</span> ";
	}
	/** This filter is documented in wp-admin/includes/media.php */
	$media_dims = apply_filters( 'media_meta', $media_dims, $post );

	$att_url = wp_get_attachment_url( $attachment_id );

	$author = new WP_User( $post->post_author );

	$uploaded_by_name = __( '(no author)' );
	$uploaded_by_link = '';

	if ( $author->exists() ) {
		$uploaded_by_name = $author->display_name ? $author->display_name : $author->nickname;
		$uploaded_by_link = get_edit_user_link( $author->ID );
	}
	?>
	<div class="misc-pub-section misc-pub-uploadedby">
		<?php if ( $uploaded_by_link ) { ?>
			<?php _e( 'Uploaded by:' ); ?> <a href="<?php echo $uploaded_by_link; ?>"><strong><?php echo $uploaded_by_name; ?></strong></a>
		<?php } else { ?>
			<?php _e( 'Uploaded by:' ); ?> <strong><?php echo $uploaded_by_name; ?></strong>
		<?php } ?>
	</div>

	<?php
	if ( $post->post_parent ) {
		$post_parent = get_post( $post->post_parent );
		if ( $post_parent ) {
			$uploaded_to_title = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
			$uploaded_to_link  = get_edit_post_link( $post->post_parent, 'raw' );
			?>
			<div class="misc-pub-section misc-pub-uploadedto">
				<?php if ( $uploaded_to_link ) { ?>
					<?php _e( 'Uploaded to:' ); ?> <a href="<?php echo $uploaded_to_link; ?>"><strong><?php echo $uploaded_to_title; ?></strong></a>
				<?php } else { ?>
					<?php _e( 'Uploaded to:' ); ?> <strong><?php echo $uploaded_to_title; ?></strong>
				<?php } ?>
			</div>
			<?php
		}
	}
	?>

	<div class="misc-pub-section misc-pub-attachment">
		<label for="attachment_url"><?php _e( 'File URL:' ); ?></label>
		<input type="text" class="widefat urlfield" readonly="readonly" name="attachment_url" id="attachment_url" value="<?php echo esc_attr( $att_url ); ?>" />
		<span class="copy-to-clipboard-container">
			<button type="button" class="button copy-attachment-url edit-media" data-clipboard-target="#attachment_url"><?php _e( 'Copy URL to clipboard' ); ?></button>
			<span class="success hidden" aria-hidden="true"><?php _e( 'Copied!' ); ?></span>
		</span>
	</div>
	<div class="misc-pub-section misc-pub-filename">
		<?php _e( 'File name:' ); ?> <strong><?php echo $filename; ?></strong>
	</div>
	<div class="misc-pub-section misc-pub-filetype">
		<?php _e( 'File type:' ); ?>
		<strong>
		<?php

		if ( preg_match( '/^.*?.(w+)$/', get_attached_file( $post->ID ), $matches ) ) {
			echo esc_html( strtoupper( $matches[1] ) );
			list( $mime_type ) = explode( '/', $post->post_mime_type );
			if ( 'image' !== $mime_type && ! empty( $meta['mime_type'] ) ) {
				if ( "$mime_type/" . strtolower( $matches[1] ) !== $meta['mime_type'] ) {
					echo ' (' . $meta['mime_type'] . ')';
				}
			}
		} else {
			echo strtoupper( str_replace( 'image/', '', $post->post_mime_type ) );
		}

		?>
		</strong>
	</div>

	<?php

	$file_size = false;

	if ( isset( $meta['filesize'] ) ) {
		$file_size = $meta['filesize'];
	} elseif ( file_exists( $file ) ) {
		$file_size = wp_filesize( $file );
	}

	if ( ! empty( $file_size ) ) {
		?>
		<div class="misc-pub-section misc-pub-filesize">
			<?php _e( 'File size:' ); ?> <strong><?php echo size_format( $file_size ); ?></strong>
		</div>
		<?php
	}

	if ( preg_match( '#^(audio|video)/#', $post->post_mime_type ) ) {
		$fields = array(
			'length_formatted' => __( 'Length:' ),
			'bitrate'          => __( 'Bitrate:' ),
		);

		/**
		 * Filters the audio and video metadata fields to be shown in the publish meta box.
		 *
		 * The key for each item in the array should correspond to an attachment
		 * metadata key, and the value should be the desired label.
		 *
		 * @since 3.7.0
		 * @since 4.9.0 Added the `$post` parameter.
		 *
		 * @param array   $fields An array of the attachment metadata keys and labels.
		 * @param WP_Post $post   WP_Post object for the current attachment.
		 */
		$fields = apply_filters( 'media_submitbox_misc_sections', $fields, $post );

		foreach ( $fields as $key => $label ) {
			if ( empty( $meta[ $key ] ) ) {
				continue;
			}

			?>
			<div class="misc-pub-section misc-pub-mime-meta misc-pub-<?php echo sanitize_html_class( $key ); ?>">
				<?php echo $label; ?>
				<strong>
				<?php

				switch ( $key ) {
					case 'bitrate':
						echo round( $meta['bitrate'] / 1000 ) . 'kb/s';
						if ( ! empty( $meta['bitrate_mode'] ) ) {
							echo ' ' . strtoupper( esc_html( $meta['bitrate_mode'] ) );
						}
						break;
					default:
						echo esc_html( $meta[ $key ] );
						break;
				}

				?>
				</strong>
			</div>
			<?php
		}

		$fields = array(
			'dataformat' => __( 'Audio Format:' ),
			'codec'      => __( 'Audio Codec:' ),
		);

		/**
		 * Filters the audio attachment metadata fields to be shown in the publish meta box.
		 *
		 * The key for each item in the array should correspond to an attachment
		 * metadata key, and the value should be the desired label.
		 *
		 * @since 3.7.0
		 * @since 4.9.0 Added the `$post` parameter.
		 *
		 * @param array   $fields An array of the attachment metadata keys and labels.
		 * @param WP_Post $post   WP_Post object for the current attachment.
		 */
		$audio_fields = apply_filters( 'audio_submitbox_misc_sections', $fields, $post );

		foreach ( $audio_fields as $key => $label ) {
			if ( empty( $meta['audio'][ $key ] ) ) {
				continue;
			}

			?>
			<div class="misc-pub-section misc-pub-audio misc-pub-<?php echo sanitize_html_class( $key ); ?>">
				<?php echo $label; ?> <strong><?php echo esc_html( $meta['audio'][ $key ] ); ?></strong>
			</div>
			<?php
		}
	}

	if ( $media_dims ) {
		?>
		<div class="misc-pub-section misc-pub-dimensions">
			<?php _e( 'Dimensions:' ); ?> <strong><?php echo $media_dims; ?></strong>
		</div>
		<?php
	}

	if ( ! empty( $meta['original_image'] ) ) {
		?>
		<div class="misc-pub-section misc-pub-original-image word-wrap-break-word">
			<?php _e( 'Original image:' ); ?>
			<a href="<?php echo esc_url( wp_get_original_image_url( $attachment_id ) ); ?>">
				<?php echo esc_html( wp_basename( wp_get_original_image_path( $attachment_id ) ) ); ?>
			</a>
		</div>
		<?php
	}
}