get_media_item

get_media_item函式用於通過其ID檢索一個媒體專案（例如，圖片或視訊）: 這個函式可以用來在一個文章或頁面上顯示一個特定的媒體專案。

檢索用於修改圖片附件的HTML表格。

function get_media_item( $attachment_id, $args = null ) {
	global $redir_tab;

	$thumb_url     = false;
	$attachment_id = (int) $attachment_id;

	if ( $attachment_id ) {
		$thumb_url = wp_get_attachment_image_src( $attachment_id, 'thumbnail', true );

		if ( $thumb_url ) {
			$thumb_url = $thumb_url[0];
		}
	}

	$post            = get_post( $attachment_id );
	$current_post_id = ! empty( $_GET['post_id'] ) ? (int) $_GET['post_id'] : 0;

	$default_args = array(
		'errors'     => null,
		'send'       => $current_post_id ? post_type_supports( get_post_type( $current_post_id ), 'editor' ) : true,
		'delete'     => true,
		'toggle'     => true,
		'show_title' => true,
	);

	$parsed_args = wp_parse_args( $args, $default_args );

	/**
	 * Filters the arguments used to retrieve an image for the edit image form.
	 *
	 * @since 3.1.0
	 *
	 * @see get_media_item
	 *
	 * @param array $parsed_args An array of arguments.
	 */
	$parsed_args = apply_filters( 'get_media_item_args', $parsed_args );

	$toggle_on  = __( 'Show' );
	$toggle_off = __( 'Hide' );

	$file     = get_attached_file( $post->ID );
	$filename = esc_html( wp_basename( $file ) );
	$title    = esc_attr( $post->post_title );

	$post_mime_types = get_post_mime_types();
	$keys            = array_keys( wp_match_mime_types( array_keys( $post_mime_types ), $post->post_mime_type ) );
	$type            = reset( $keys );
	$type_html       = "<input type='hidden' id='type-of-$attachment_id' value='" . esc_attr( $type ) . "' />";

	$form_fields = get_attachment_fields_to_edit( $post, $parsed_args['errors'] );

	if ( $parsed_args['toggle'] ) {
		$class        = empty( $parsed_args['errors'] ) ? 'startclosed' : 'startopen';
		$toggle_links = "
		<a class='toggle describe-toggle-on' href='#'>$toggle_on</a>
		<a class='toggle describe-toggle-off' href='#'>$toggle_off</a>";
	} else {
		$class        = '';
		$toggle_links = '';
	}

	$display_title = ( ! empty( $title ) ) ? $title : $filename; // $title shouldn't ever be empty, but just in case.
	$display_title = $parsed_args['show_title'] ? "<div class='filename new'><span class='title'>" . wp_html_excerpt( $display_title, 60, '&hellip;' ) . '</span></div>' : '';

	$gallery = ( ( isset( $_REQUEST['tab'] ) && 'gallery' === $_REQUEST['tab'] ) || ( isset( $redir_tab ) && 'gallery' === $redir_tab ) );
	$order   = '';

	foreach ( $form_fields as $key => $val ) {
		if ( 'menu_order' === $key ) {
			if ( $gallery ) {
				$order = "<div class='menu_order'> <input class='menu_order_input' type='text' id='attachments[$attachment_id][menu_order]' name='attachments[$attachment_id][menu_order]' value='" . esc_attr( $val['value'] ) . "' /></div>";
			} else {
				$order = "<input type='hidden' name='attachments[$attachment_id][menu_order]' value='" . esc_attr( $val['value'] ) . "' />";
			}

			unset( $form_fields['menu_order'] );
			break;
		}
	}

	$media_dims = '';
	$meta       = wp_get_attachment_metadata( $post->ID );

	if ( isset( $meta['width'], $meta['height'] ) ) {
		$media_dims .= "<span id='media-dims-$post->ID'>{$meta['width']}&nbsp;&times;&nbsp;{$meta['height']}</span> ";
	}

	/**
	 * Filters the media metadata.
	 *
	 * @since 2.5.0
	 *
	 * @param string  $media_dims The HTML markup containing the media dimensions.
	 * @param WP_Post $post       The WP_Post attachment object.
	 */
	$media_dims = apply_filters( 'media_meta', $media_dims, $post );

	$image_edit_button = '';

	if ( wp_attachment_is_image( $post->ID ) && wp_image_editor_supports( array( 'mime_type' => $post->post_mime_type ) ) ) {
		$nonce             = wp_create_nonce( "image_editor-$post->ID" );
		$image_edit_button = "<input type='button' id='imgedit-open-btn-$post->ID' onclick='imageEdit.open( $post->ID, "$nonce" )' class='button' value='" . esc_attr__( 'Edit Image' ) . "' /> <span class='spinner'></span>";
	}

	$attachment_url = get_permalink( $attachment_id );

	$item = "
		$type_html
		$toggle_links
		$order
		$display_title
		<table class='slidetoggle describe $class'>
			<thead class='media-item-info' id='media-head-$post->ID'>
			<tr>
			<td class='A1B1' id='thumbnail-head-$post->ID'>
			<p><a href='$attachment_url' target='_blank'><img class='thumbnail' src='$thumb_url' alt='' /></a></p>
			<p>$image_edit_button</p>
			</td>
			<td>
			<p><strong>" . __( 'File name:' ) . "</strong> $filename</p>
			<p><strong>" . __( 'File type:' ) . "</strong> $post->post_mime_type</p>
			<p><strong>" . __( 'Upload date:' ) . '</strong> ' . mysql2date( __( 'F j, Y' ), $post->post_date ) . '</p>';

	if ( ! empty( $media_dims ) ) {
		$item .= '<p><strong>' . __( 'Dimensions:' ) . "</strong> $media_dims</p>n";
	}

	$item .= "</td></tr>n";

	$item .= "
		</thead>
		<tbody>
		<tr><td colspan='2' class='imgedit-response' id='imgedit-response-$post->ID'></td></tr>n
		<tr><td style='display:none' colspan='2' class='image-editor' id='image-editor-$post->ID'></td></tr>n
		<tr><td colspan='2'><p class='media-types media-types-required-info'>" .
			wp_required_field_message() .
		"</p></td></tr>n";

	$defaults = array(
		'input'      => 'text',
		'required'   => false,
		'value'      => '',
		'extra_rows' => array(),
	);

	if ( $parsed_args['send'] ) {
		$parsed_args['send'] = get_submit_button( __( 'Insert into Post' ), '', "send[$attachment_id]", false );
	}

	$delete = empty( $parsed_args['delete'] ) ? '' : $parsed_args['delete'];
	if ( $delete && current_user_can( 'delete_post', $attachment_id ) ) {
		if ( ! EMPTY_TRASH_DAYS ) {
			$delete = "<a href='" . wp_nonce_url( "post.php?action=delete&amp;post=$attachment_id", 'delete-post_' . $attachment_id ) . "' id='del[$attachment_id]' class='delete-permanently'>" . __( 'Delete Permanently' ) . '</a>';
		} elseif ( ! MEDIA_TRASH ) {
			$delete = "<a href='#' class='del-link' onclick="document.getElementById('del_attachment_$attachment_id').style.display='block';return false;">" . __( 'Delete' ) . "</a>
				<div id='del_attachment_$attachment_id' class='del-attachment' style='display:none;'>" .
				/* translators: %s: File name. */
				'<p>' . sprintf( __( 'You are about to delete %s.' ), '<strong>' . $filename . '</strong>' ) . "</p>
				<a href='" . wp_nonce_url( "post.php?action=delete&amp;post=$attachment_id", 'delete-post_' . $attachment_id ) . "' id='del[$attachment_id]' class='button'>" . __( 'Continue' ) . "</a>
				<a href='#' class='button' onclick="this.parentNode.style.display='none';return false;">" . __( 'Cancel' ) . '</a>
				</div>';
		} else {
			$delete = "<a href='" . wp_nonce_url( "post.php?action=trash&amp;post=$attachment_id", 'trash-post_' . $attachment_id ) . "' id='del[$attachment_id]' class='delete'>" . __( 'Move to Trash' ) . "</a>
			<a href='" . wp_nonce_url( "post.php?action=untrash&amp;post=$attachment_id", 'untrash-post_' . $attachment_id ) . "' id='undo[$attachment_id]' class='undo hidden'>" . __( 'Undo' ) . '</a>';
		}
	} else {
		$delete = '';
	}

	$thumbnail       = '';
	$calling_post_id = 0;

	if ( isset( $_GET['post_id'] ) ) {
		$calling_post_id = absint( $_GET['post_id'] );
	} elseif ( isset( $_POST ) && count( $_POST ) ) {// Like for async-upload where $_GET['post_id'] isn't set.
		$calling_post_id = $post->post_parent;
	}

	if ( 'image' === $type && $calling_post_id
		&& current_theme_supports( 'post-thumbnails', get_post_type( $calling_post_id ) )
		&& post_type_supports( get_post_type( $calling_post_id ), 'thumbnail' )
		&& get_post_thumbnail_id( $calling_post_id ) != $attachment_id
	) {

		$calling_post             = get_post( $calling_post_id );
		$calling_post_type_object = get_post_type_object( $calling_post->post_type );

		$ajax_nonce = wp_create_nonce( "set_post_thumbnail-$calling_post_id" );
		$thumbnail  = "<a class='wp-post-thumbnail' id='wp-post-thumbnail-" . $attachment_id . "' href='#' onclick='WPSetAsThumbnail("$attachment_id", "$ajax_nonce");return false;'>" . esc_html( $calling_post_type_object->labels->use_featured_image ) . '</a>';
	}

	if ( ( $parsed_args['send'] || $thumbnail || $delete ) && ! isset( $form_fields['buttons'] ) ) {
		$form_fields['buttons'] = array( 'tr' => "tt<tr class='submit'><td></td><td class='savesend'>" . $parsed_args['send'] . " $thumbnail $delete</td></tr>n" );
	}

	$hidden_fields = array();

	foreach ( $form_fields as $id => $field ) {
		if ( '_' === $id[0] ) {
			continue;
		}

		if ( ! empty( $field['tr'] ) ) {
			$item .= $field['tr'];
			continue;
		}

		$field = array_merge( $defaults, $field );
		$name  = "attachments[$attachment_id][$id]";

		if ( 'hidden' === $field['input'] ) {
			$hidden_fields[ $name ] = $field['value'];
			continue;
		}

		$required      = $field['required'] ? ' ' . wp_required_field_indicator() : '';
		$required_attr = $field['required'] ? ' required' : '';
		$class         = $id;
		$class        .= $field['required'] ? ' form-required' : '';

		$item .= "tt<tr class='$class'>nttt<th scope='row' class='label'><label for='$name'><span class='alignleft'>{$field['label']}{$required}</span><br class='clear' /></label></th>nttt<td class='field'>";

		if ( ! empty( $field[ $field['input'] ] ) ) {
			$item .= $field[ $field['input'] ];
		} elseif ( 'textarea' === $field['input'] ) {
			if ( 'post_content' === $id && user_can_richedit() ) {
				// Sanitize_post() skips the post_content when user_can_richedit.
				$field['value'] = htmlspecialchars( $field['value'], ENT_QUOTES );
			}
			// Post_excerpt is already escaped by sanitize_post() in get_attachment_fields_to_edit().
			$item .= "<textarea id='$name' name='$name'{$required_attr}>" . $field['value'] . '</textarea>';
		} else {
			$item .= "<input type='text' class='text' id='$name' name='$name' value='" . esc_attr( $field['value'] ) . "'{$required_attr} />";
		}

		if ( ! empty( $field['helps'] ) ) {
			$item .= "<p class='help'>" . implode( "</p>n<p class='help'>", array_unique( (array) $field['helps'] ) ) . '</p>';
		}
		$item .= "</td>ntt</tr>n";

		$extra_rows = array();

		if ( ! empty( $field['errors'] ) ) {
			foreach ( array_unique( (array) $field['errors'] ) as $error ) {
				$extra_rows['error'][] = $error;
			}
		}

		if ( ! empty( $field['extra_rows'] ) ) {
			foreach ( $field['extra_rows'] as $class => $rows ) {
				foreach ( (array) $rows as $html ) {
					$extra_rows[ $class ][] = $html;
				}
			}
		}

		foreach ( $extra_rows as $class => $rows ) {
			foreach ( $rows as $html ) {
				$item .= "tt<tr><td></td><td class='$class'>$html</td></tr>n";
			}
		}
	}

	if ( ! empty( $form_fields['_final'] ) ) {
		$item .= "tt<tr class='final'><td colspan='2'>{$form_fields['_final']}</td></tr>n";
	}

	$item .= "t</tbody>n";
	$item .= "t</table>n";

	foreach ( $hidden_fields as $name => $value ) {
		$item .= "t<input type='hidden' name='$name' id='$name' value='" . esc_attr( $value ) . "' />n";
	}

	if ( $post->post_parent < 1 && isset( $_REQUEST['post_id'] ) ) {
		$parent      = (int) $_REQUEST['post_id'];
		$parent_name = "attachments[$attachment_id][post_parent]";
		$item       .= "t<input type='hidden' name='$parent_name' id='$parent_name' value='$parent' />n";
	}

	return $item;
}