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  • WordPress函数wp_generate_attachment_metadata()用法 获取附件的meta信息

    正文概述 知事网   2020-09-17   19

    描述:

    获取一个附件(图片/文件)的meta信息

    用法:

    <?php wp_generate_attachment_metadata( $attachment_id, $file ); ?>

    参数:

    $attachment_id
    
    (int) (必填) 要处理的附件ID。
    
    默认值: None
    
    $file
    
    (string) (必填) 文件在服务器上的位置。使用绝对路径而不是文件的URI。文件必须在uploads目录中。请参阅wp_upload_dir()
    
    默认值: None

    源文件:

    /**
    * Generate post thumbnail attachment meta data.
    *
    * @since 2.1.0
    *
    * @global array $_wp_additional_image_sizes
    *
    * @param int $attachment_id Attachment Id to process.
    * @param string $file Filepath of the Attached image.
    * @return mixed Metadata for attachment.
    */
    function wp_generate_attachment_metadata( $attachment_id, $file ) {
    $attachment = get_post( $attachment_id );
    
    $metadata = array();
    $support = false;
    if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
    $imagesize = getimagesize( $file );
    $metadata['width'] = $imagesize[0];
    $metadata['height'] = $imagesize[1];
    
    // Make the file path relative to the upload dir.
    $metadata['file'] = _wp_relative_upload_path($file);
    
    // Make thumbnails and other intermediate sizes.
    global $_wp_additional_image_sizes;
    
    $sizes = array();
    foreach ( get_intermediate_image_sizes() as $s ) {
    $sizes[$s] = array( 'width' => '', 'height' => '', 'crop' => false );
    if ( isset( $_wp_additional_image_sizes[$s]['width'] ) )
    $sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] ); // For theme-added sizes
    else
    $sizes[$s]['width'] = get_option( "{$s}_size_w" ); // For default sizes set in options
    if ( isset( $_wp_additional_image_sizes[$s]['height'] ) )
    $sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] ); // For theme-added sizes
    else
    $sizes[$s]['height'] = get_option( "{$s}_size_h" ); // For default sizes set in options
    if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) )
    $sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop']; // For theme-added sizes
    else
    $sizes[$s]['crop'] = get_option( "{$s}_crop" ); // For default sizes set in options
    }
    
    /**
    * Filter the image sizes automatically generated when uploading an image.
    *
    * @since 2.9.0
    *
    * @param array $sizes An associative array of image sizes.
    */
    $sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes );
    
    if ( $sizes ) {
    $editor = wp_get_image_editor( $file );
    
    if ( ! is_wp_error( $editor ) )
    $metadata['sizes'] = $editor->multi_resize( $sizes );
    } else {
    $metadata['sizes'] = array();
    }
    
    // Fetch additional metadata from EXIF/IPTC.
    $image_meta = wp_read_image_metadata( $file );
    if ( $image_meta )
    $metadata['image_meta'] = $image_meta;
    
    } elseif ( wp_attachment_is( 'video', $attachment ) ) {
    $metadata = wp_read_video_metadata( $file );
    $support = current_theme_supports( 'post-thumbnails', 'attachment:video' ) || post_type_supports( 'attachment:video', 'thumbnail' );
    } elseif ( wp_attachment_is( 'audio', $attachment ) ) {
    $metadata = wp_read_audio_metadata( $file );
    $support = current_theme_supports( 'post-thumbnails', 'attachment:audio' ) || post_type_supports( 'attachment:audio', 'thumbnail' );
    }
    
    if ( $support && ! empty( $metadata['image']['data'] ) ) {
    // Check for existing cover.
    $hash = md5( $metadata['image']['data'] );
    $posts = get_posts( array(
    'fields' => 'ids',
    'post_type' => 'attachment',
    'post_mime_type' => $metadata['image']['mime'],
    'post_status' => 'inherit',
    'posts_per_page' => 1,
    'meta_key' => '_cover_hash',
    'meta_value' => $hash
    ) );
    $exists = reset( $posts );
    
    if ( ! empty( $exists ) ) {
    update_post_meta( $attachment_id, '_thumbnail_id', $exists );
    } else {
    $ext = '.jpg';
    switch ( $metadata['image']['mime'] ) {
    case 'image/gif':
    $ext = '.gif';
    break;
    case 'image/png':
    $ext = '.png';
    break;
    }
    $basename = str_replace( '.', '-', basename( $file ) ) . '-image' . $ext;
    $uploaded = wp_upload_bits( $basename, '', $metadata['image']['data'] );
    if ( false === $uploaded['error'] ) {
    $image_attachment = array(
    'post_mime_type' => $metadata['image']['mime'],
    'post_type' => 'attachment',
    'post_content' => '',
    );
    /**
    * Filter the parameters for the attachment thumbnail creation.
    *
    * @since 3.9.0
    *
    * @param array $image_attachment An array of parameters to create the thumbnail.
    * @param array $metadata Current attachment metadata.
    * @param array $uploaded An array containing the thumbnail path and url.
    */
    $image_attachment = apply_filters( 'attachment_thumbnail_args', $image_attachment, $metadata, $uploaded );
    
    $sub_attachment_id = wp_insert_attachment( $image_attachment, $uploaded['file'] );
    add_post_meta( $sub_attachment_id, '_cover_hash', $hash );
    $attach_data = wp_generate_attachment_metadata( $sub_attachment_id, $uploaded['file'] );
    wp_update_attachment_metadata( $sub_attachment_id, $attach_data );
    update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id );
    }
    }
    }
    
    // Remove the blob of binary data from the array.
    unset( $metadata['image']['data'] );
    
    /**
    * Filter the generated attachment meta data.
    *
    * @since 2.1.0
    *
    * @param array $metadata An array of attachment meta data.
    * @param int $attachment_id Current attachment ID.
    */
    return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id );
    }
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