wp_generate_attachment_metadata( int $attachment_id, string $file )
Generate post thumbnail attachment meta data.
Parameters
- $attachment_id
-
(Required) Attachment Id to process.
- $file
-
(Required) Filepath of the Attached image.
Return
(mixed) Metadata for attachment.
Source
File: wp-admin/includes/image.php
function wp_generate_attachment_metadata( $attachment_id, $file ) {
$attachment = get_post( $attachment_id );
$metadata = array();
$support = false;
$mime_type = get_post_mime_type( $attachment );
if ( preg_match( '!^image/!', $mime_type ) && 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.
$_wp_additional_image_sizes = wp_get_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'] ) ) {
// For theme-added sizes
$sizes[$s]['width'] = intval( $_wp_additional_image_sizes[$s]['width'] );
} else {
// For default sizes set in options
$sizes[$s]['width'] = get_option( "{$s}_size_w" );
}
if ( isset( $_wp_additional_image_sizes[$s]['height'] ) ) {
// For theme-added sizes
$sizes[$s]['height'] = intval( $_wp_additional_image_sizes[$s]['height'] );
} else {
// For default sizes set in options
$sizes[$s]['height'] = get_option( "{$s}_size_h" );
}
if ( isset( $_wp_additional_image_sizes[$s]['crop'] ) ) {
// For theme-added sizes
$sizes[$s]['crop'] = $_wp_additional_image_sizes[$s]['crop'];
} else {
// For default sizes set in options
$sizes[$s]['crop'] = get_option( "{$s}_crop" );
}
}
/**
* Filters the image sizes automatically generated when uploading an image.
*
* @since WP-2.9.0
* @since WP-4.4.0 Added the `$metadata` argument.
*
* @param array $sizes An associative array of image sizes.
* @param array $metadata An associative array of image metadata: width, height, file.
*/
$sizes = apply_filters( 'intermediate_image_sizes_advanced', $sizes, $metadata );
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' => '',
);
/**
* Filters the parameters for the attachment thumbnail creation.
*
* @since WP-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 );
}
}
}
// Try to create image thumbnails for PDFs
else if ( 'application/pdf' === $mime_type ) {
$fallback_sizes = array(
'thumbnail',
'medium',
'large',
);
/**
* Filters the image sizes generated for non-image mime types.
*
* @since WP-4.7.0
*
* @param array $fallback_sizes An array of image size names.
* @param array $metadata Current attachment metadata.
*/
$fallback_sizes = apply_filters( 'fallback_intermediate_image_sizes', $fallback_sizes, $metadata );
$sizes = array();
$_wp_additional_image_sizes = wp_get_additional_image_sizes();
foreach ( $fallback_sizes as $s ) {
if ( isset( $_wp_additional_image_sizes[ $s ]['width'] ) ) {
$sizes[ $s ]['width'] = intval( $_wp_additional_image_sizes[ $s ]['width'] );
} else {
$sizes[ $s ]['width'] = get_option( "{$s}_size_w" );
}
if ( isset( $_wp_additional_image_sizes[ $s ]['height'] ) ) {
$sizes[ $s ]['height'] = intval( $_wp_additional_image_sizes[ $s ]['height'] );
} else {
$sizes[ $s ]['height'] = get_option( "{$s}_size_h" );
}
if ( isset( $_wp_additional_image_sizes[ $s ]['crop'] ) ) {
$sizes[ $s ]['crop'] = $_wp_additional_image_sizes[ $s ]['crop'];
} else {
// Force thumbnails to be soft crops.
if ( 'thumbnail' !== $s ) {
$sizes[ $s ]['crop'] = get_option( "{$s}_crop" );
}
}
}
// Only load PDFs in an image editor if we're processing sizes.
if ( ! empty( $sizes ) ) {
$editor = wp_get_image_editor( $file );
if ( ! is_wp_error( $editor ) ) { // No support for this type of file
/*
* PDFs may have the same file filename as JPEGs.
* Ensure the PDF preview image does not overwrite any JPEG images that already exist.
*/
$dirname = dirname( $file ) . '/';
$ext = '.' . pathinfo( $file, PATHINFO_EXTENSION );
$preview_file = $dirname . wp_unique_filename( $dirname, wp_basename( $file, $ext ) . '-pdf.jpg' );
$uploaded = $editor->save( $preview_file, 'image/jpeg' );
unset( $editor );
// Resize based on the full size image, rather than the source.
if ( ! is_wp_error( $uploaded ) ) {
$editor = wp_get_image_editor( $uploaded['path'] );
unset( $uploaded['path'] );
if ( ! is_wp_error( $editor ) ) {
$metadata['sizes'] = $editor->multi_resize( $sizes );
$metadata['sizes']['full'] = $uploaded;
}
}
}
}
}
// Remove the blob of binary data from the array.
if ( $metadata ) {
unset( $metadata['image']['data'] );
}
/**
* Filters the generated attachment meta data.
*
* @since WP-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 );
}
Changelog
Version | Description |
---|---|
WP-2.1.0 | Introduced. |