mirrored from git://develop.git.wordpress.org/
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image.php
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image.php
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<?php
/**
* File contains all the administration image manipulation functions.
*
* @package WordPress
* @subpackage Administration
*/
/**
* Crops an image to a given size.
*
* @since 2.1.0
*
* @param string|int $src The source file or Attachment ID.
* @param int $src_x The start x position to crop from.
* @param int $src_y The start y position to crop from.
* @param int $src_w The width to crop.
* @param int $src_h The height to crop.
* @param int $dst_w The destination width.
* @param int $dst_h The destination height.
* @param bool|false $src_abs Optional. If the source crop points are absolute.
* @param string|false $dst_file Optional. The destination file to write to.
* @return string|WP_Error New filepath on success, WP_Error on failure.
*/
function wp_crop_image( $src, $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs = false, $dst_file = false ) {
$src_file = $src;
if ( is_numeric( $src ) ) { // Handle int as attachment ID.
$src_file = get_attached_file( $src );
if ( ! file_exists( $src_file ) ) {
/*
* If the file doesn't exist, attempt a URL fopen on the src link.
* This can occur with certain file replication plugins.
*/
$src = _load_image_to_edit_path( $src, 'full' );
} else {
$src = $src_file;
}
}
$editor = wp_get_image_editor( $src );
if ( is_wp_error( $editor ) ) {
return $editor;
}
$src = $editor->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h, $src_abs );
if ( is_wp_error( $src ) ) {
return $src;
}
if ( ! $dst_file ) {
$dst_file = str_replace( wp_basename( $src_file ), 'cropped-' . wp_basename( $src_file ), $src_file );
}
/*
* The directory containing the original file may no longer exist when
* using a replication plugin.
*/
wp_mkdir_p( dirname( $dst_file ) );
$dst_file = dirname( $dst_file ) . '/' . wp_unique_filename( dirname( $dst_file ), wp_basename( $dst_file ) );
$result = $editor->save( $dst_file );
if ( is_wp_error( $result ) ) {
return $result;
}
if ( ! empty( $result['path'] ) ) {
return $result['path'];
}
return $dst_file;
}
/**
* Compare the existing image sub-sizes (as saved in the attachment meta)
* to the currently registered image sub-sizes, and return the difference.
*
* Registered sub-sizes that are larger than the image are skipped.
*
* @since 5.3.0
*
* @param int $attachment_id The image attachment post ID.
* @return array[] Associative array of arrays of image sub-size information for
* missing image sizes, keyed by image size name.
*/
function wp_get_missing_image_subsizes( $attachment_id ) {
if ( ! wp_attachment_is_image( $attachment_id ) ) {
return array();
}
$registered_sizes = wp_get_registered_image_subsizes();
$image_meta = wp_get_attachment_metadata( $attachment_id );
// Meta error?
if ( empty( $image_meta ) ) {
return $registered_sizes;
}
// Use the originally uploaded image dimensions as full_width and full_height.
if ( ! empty( $image_meta['original_image'] ) ) {
$image_file = wp_get_original_image_path( $attachment_id );
$imagesize = wp_getimagesize( $image_file );
}
if ( ! empty( $imagesize ) ) {
$full_width = $imagesize[0];
$full_height = $imagesize[1];
} else {
$full_width = (int) $image_meta['width'];
$full_height = (int) $image_meta['height'];
}
$possible_sizes = array();
// Skip registered sizes that are too large for the uploaded image.
foreach ( $registered_sizes as $size_name => $size_data ) {
if ( image_resize_dimensions( $full_width, $full_height, $size_data['width'], $size_data['height'], $size_data['crop'] ) ) {
$possible_sizes[ $size_name ] = $size_data;
}
}
if ( empty( $image_meta['sizes'] ) ) {
$image_meta['sizes'] = array();
}
/*
* Remove sizes that already exist. Only checks for matching "size names".
* It is possible that the dimensions for a particular size name have changed.
* For example the user has changed the values on the Settings -> Media screen.
* However we keep the old sub-sizes with the previous dimensions
* as the image may have been used in an older post.
*/
$missing_sizes = array_diff_key( $possible_sizes, $image_meta['sizes'] );
/**
* Filters the array of missing image sub-sizes for an uploaded image.
*
* @since 5.3.0
*
* @param array[] $missing_sizes Associative array of arrays of image sub-size information for
* missing image sizes, keyed by image size name.
* @param array $image_meta The image meta data.
* @param int $attachment_id The image attachment post ID.
*/
return apply_filters( 'wp_get_missing_image_subsizes', $missing_sizes, $image_meta, $attachment_id );
}
/**
* If any of the currently registered image sub-sizes are missing,
* create them and update the image meta data.
*
* @since 5.3.0
*
* @param int $attachment_id The image attachment post ID.
* @return array|WP_Error The updated image meta data array or WP_Error object
* if both the image meta and the attached file are missing.
*/
function wp_update_image_subsizes( $attachment_id ) {
$image_meta = wp_get_attachment_metadata( $attachment_id );
$image_file = wp_get_original_image_path( $attachment_id );
if ( empty( $image_meta ) || ! is_array( $image_meta ) ) {
/*
* Previously failed upload?
* If there is an uploaded file, make all sub-sizes and generate all of the attachment meta.
*/
if ( ! empty( $image_file ) ) {
$image_meta = wp_create_image_subsizes( $image_file, $attachment_id );
} else {
return new WP_Error( 'invalid_attachment', __( 'The attached file cannot be found.' ) );
}
} else {
$missing_sizes = wp_get_missing_image_subsizes( $attachment_id );
if ( empty( $missing_sizes ) ) {
return $image_meta;
}
// This also updates the image meta.
$image_meta = _wp_make_subsizes( $missing_sizes, $image_file, $image_meta, $attachment_id );
}
/** This filter is documented in wp-admin/includes/image.php */
$image_meta = apply_filters( 'wp_generate_attachment_metadata', $image_meta, $attachment_id, 'update' );
// Save the updated metadata.
wp_update_attachment_metadata( $attachment_id, $image_meta );
return $image_meta;
}
/**
* Updates the attached file and image meta data when the original image was edited.
*
* @since 5.3.0
* @since 6.0.0 The `$filesize` value was added to the returned array.
* @access private
*
* @param array $saved_data The data returned from WP_Image_Editor after successfully saving an image.
* @param string $original_file Path to the original file.
* @param array $image_meta The image meta data.
* @param int $attachment_id The attachment post ID.
* @return array The updated image meta data.
*/
function _wp_image_meta_replace_original( $saved_data, $original_file, $image_meta, $attachment_id ) {
$new_file = $saved_data['path'];
// Update the attached file meta.
update_attached_file( $attachment_id, $new_file );
// Width and height of the new image.
$image_meta['width'] = $saved_data['width'];
$image_meta['height'] = $saved_data['height'];
// Make the file path relative to the upload dir.
$image_meta['file'] = _wp_relative_upload_path( $new_file );
// Add image file size.
$image_meta['filesize'] = wp_filesize( $new_file );
// Store the original image file name in image_meta.
$image_meta['original_image'] = wp_basename( $original_file );
return $image_meta;
}
/**
* Creates image sub-sizes, adds the new data to the image meta `sizes` array, and updates the image metadata.
*
* Intended for use after an image is uploaded. Saves/updates the image metadata after each
* sub-size is created. If there was an error, it is added to the returned image metadata array.
*
* @since 5.3.0
*
* @param string $file Full path to the image file.
* @param int $attachment_id Attachment ID to process.
* @return array The image attachment meta data.
*/
function wp_create_image_subsizes( $file, $attachment_id ) {
$imagesize = wp_getimagesize( $file );
if ( empty( $imagesize ) ) {
// File is not an image.
return array();
}
// Default image meta.
$image_meta = array(
'width' => $imagesize[0],
'height' => $imagesize[1],
'file' => _wp_relative_upload_path( $file ),
'filesize' => wp_filesize( $file ),
'sizes' => array(),
);
// Fetch additional metadata from EXIF/IPTC.
$exif_meta = wp_read_image_metadata( $file );
if ( $exif_meta ) {
$image_meta['image_meta'] = $exif_meta;
}
// Do not scale (large) PNG images. May result in sub-sizes that have greater file size than the original. See #48736.
if ( 'image/png' !== $imagesize['mime'] ) {
/**
* Filters the "BIG image" threshold value.
*
* If the original image width or height is above the threshold, it will be scaled down. The threshold is
* used as max width and max height. The scaled down image will be used as the largest available size, including
* the `_wp_attached_file` post meta value.
*
* Returning `false` from the filter callback will disable the scaling.
*
* @since 5.3.0
*
* @param int $threshold The threshold value in pixels. Default 2560.
* @param array $imagesize {
* Indexed array of the image width and height in pixels.
*
* @type int $0 The image width.
* @type int $1 The image height.
* }
* @param string $file Full path to the uploaded image file.
* @param int $attachment_id Attachment post ID.
*/
$threshold = (int) apply_filters( 'big_image_size_threshold', 2560, $imagesize, $file, $attachment_id );
/*
* If the original image's dimensions are over the threshold,
* scale the image and use it as the "full" size.
*/
if ( $threshold && ( $image_meta['width'] > $threshold || $image_meta['height'] > $threshold ) ) {
$editor = wp_get_image_editor( $file );
if ( is_wp_error( $editor ) ) {
// This image cannot be edited.
return $image_meta;
}
// Resize the image.
$resized = $editor->resize( $threshold, $threshold );
$rotated = null;
// If there is EXIF data, rotate according to EXIF Orientation.
if ( ! is_wp_error( $resized ) && is_array( $exif_meta ) ) {
$resized = $editor->maybe_exif_rotate();
$rotated = $resized;
}
if ( ! is_wp_error( $resized ) ) {
/*
* Append "-scaled" to the image file name. It will look like "my_image-scaled.jpg".
* This doesn't affect the sub-sizes names as they are generated from the original image (for best quality).
*/
$saved = $editor->save( $editor->generate_filename( 'scaled' ) );
if ( ! is_wp_error( $saved ) ) {
$image_meta = _wp_image_meta_replace_original( $saved, $file, $image_meta, $attachment_id );
// If the image was rotated update the stored EXIF data.
if ( true === $rotated && ! empty( $image_meta['image_meta']['orientation'] ) ) {
$image_meta['image_meta']['orientation'] = 1;
}
} else {
// TODO: Log errors.
}
} else {
// TODO: Log errors.
}
} elseif ( ! empty( $exif_meta['orientation'] ) && 1 !== (int) $exif_meta['orientation'] ) {
// Rotate the whole original image if there is EXIF data and "orientation" is not 1.
$editor = wp_get_image_editor( $file );
if ( is_wp_error( $editor ) ) {
// This image cannot be edited.
return $image_meta;
}
// Rotate the image.
$rotated = $editor->maybe_exif_rotate();
if ( true === $rotated ) {
// Append `-rotated` to the image file name.
$saved = $editor->save( $editor->generate_filename( 'rotated' ) );
if ( ! is_wp_error( $saved ) ) {
$image_meta = _wp_image_meta_replace_original( $saved, $file, $image_meta, $attachment_id );
// Update the stored EXIF data.
if ( ! empty( $image_meta['image_meta']['orientation'] ) ) {
$image_meta['image_meta']['orientation'] = 1;
}
} else {
// TODO: Log errors.
}
}
}
}
/*
* Initial save of the new metadata.
* At this point the file was uploaded and moved to the uploads directory
* but the image sub-sizes haven't been created yet and the `sizes` array is empty.
*/
wp_update_attachment_metadata( $attachment_id, $image_meta );
$new_sizes = wp_get_registered_image_subsizes();
/**
* Filters the image sizes automatically generated when uploading an image.
*
* @since 2.9.0
* @since 4.4.0 Added the `$image_meta` argument.
* @since 5.3.0 Added the `$attachment_id` argument.
*
* @param array $new_sizes Associative array of image sizes to be created.
* @param array $image_meta The image meta data: width, height, file, sizes, etc.
* @param int $attachment_id The attachment post ID for the image.
*/
$new_sizes = apply_filters( 'intermediate_image_sizes_advanced', $new_sizes, $image_meta, $attachment_id );
return _wp_make_subsizes( $new_sizes, $file, $image_meta, $attachment_id );
}
/**
* Low-level function to create image sub-sizes.
*
* Updates the image meta after each sub-size is created.
* Errors are stored in the returned image metadata array.
*
* @since 5.3.0
* @access private
*
* @param array $new_sizes Array defining what sizes to create.
* @param string $file Full path to the image file.
* @param array $image_meta The attachment meta data array.
* @param int $attachment_id Attachment ID to process.
* @return array The attachment meta data with updated `sizes` array. Includes an array of errors encountered while resizing.
*/
function _wp_make_subsizes( $new_sizes, $file, $image_meta, $attachment_id ) {
if ( empty( $image_meta ) || ! is_array( $image_meta ) ) {
// Not an image attachment.
return array();
}
// Check if any of the new sizes already exist.
if ( isset( $image_meta['sizes'] ) && is_array( $image_meta['sizes'] ) ) {
foreach ( $image_meta['sizes'] as $size_name => $size_meta ) {
/*
* Only checks "size name" so we don't override existing images even if the dimensions
* don't match the currently defined size with the same name.
* To change the behavior, unset changed/mismatched sizes in the `sizes` array in image meta.
*/
if ( array_key_exists( $size_name, $new_sizes ) ) {
unset( $new_sizes[ $size_name ] );
}
}
} else {
$image_meta['sizes'] = array();
}
if ( empty( $new_sizes ) ) {
// Nothing to do...
return $image_meta;
}
/*
* Sort the image sub-sizes in order of priority when creating them.
* This ensures there is an appropriate sub-size the user can access immediately
* even when there was an error and not all sub-sizes were created.
*/
$priority = array(
'medium' => null,
'large' => null,
'thumbnail' => null,
'medium_large' => null,
);
$new_sizes = array_filter( array_merge( $priority, $new_sizes ) );
$editor = wp_get_image_editor( $file );
if ( is_wp_error( $editor ) ) {
// The image cannot be edited.
return $image_meta;
}
// If stored EXIF data exists, rotate the source image before creating sub-sizes.
if ( ! empty( $image_meta['image_meta'] ) ) {
$rotated = $editor->maybe_exif_rotate();
if ( is_wp_error( $rotated ) ) {
// TODO: Log errors.
}
}
if ( method_exists( $editor, 'make_subsize' ) ) {
foreach ( $new_sizes as $new_size_name => $new_size_data ) {
$new_size_meta = $editor->make_subsize( $new_size_data );
if ( is_wp_error( $new_size_meta ) ) {
// TODO: Log errors.
} else {
// Save the size meta value.
$image_meta['sizes'][ $new_size_name ] = $new_size_meta;
wp_update_attachment_metadata( $attachment_id, $image_meta );
}
}
} else {
// Fall back to `$editor->multi_resize()`.
$created_sizes = $editor->multi_resize( $new_sizes );
if ( ! empty( $created_sizes ) ) {
$image_meta['sizes'] = array_merge( $image_meta['sizes'], $created_sizes );
wp_update_attachment_metadata( $attachment_id, $image_meta );
}
}
return $image_meta;
}
/**
* Copy parent attachment properties to newly cropped image.
*
* @since 6.5.0
*
* @param string $cropped Path to the cropped image file.
* @param int $parent_attachment_id Parent file Attachment ID.
* @param string $context Control calling the function.
* @return array Properties of attachment.
*/
function wp_copy_parent_attachment_properties( $cropped, $parent_attachment_id, $context = '' ) {
$parent = get_post( $parent_attachment_id );
$parent_url = wp_get_attachment_url( $parent->ID );
$parent_basename = wp_basename( $parent_url );
$url = str_replace( wp_basename( $parent_url ), wp_basename( $cropped ), $parent_url );
$size = wp_getimagesize( $cropped );
$image_type = $size ? $size['mime'] : 'image/jpeg';
$sanitized_post_title = sanitize_file_name( $parent->post_title );
$use_original_title = (
( '' !== trim( $parent->post_title ) ) &&
/*
* Check if the original image has a title other than the "filename" default,
* meaning the image had a title when originally uploaded or its title was edited.
*/
( $parent_basename !== $sanitized_post_title ) &&
( pathinfo( $parent_basename, PATHINFO_FILENAME ) !== $sanitized_post_title )
);
$use_original_description = ( '' !== trim( $parent->post_content ) );
$attachment = array(
'post_title' => $use_original_title ? $parent->post_title : wp_basename( $cropped ),
'post_content' => $use_original_description ? $parent->post_content : $url,
'post_mime_type' => $image_type,
'guid' => $url,
'context' => $context,
);
// Copy the image caption attribute (post_excerpt field) from the original image.
if ( '' !== trim( $parent->post_excerpt ) ) {
$attachment['post_excerpt'] = $parent->post_excerpt;
}
// Copy the image alt text attribute from the original image.
if ( '' !== trim( $parent->_wp_attachment_image_alt ) ) {
$attachment['meta_input'] = array(
'_wp_attachment_image_alt' => wp_slash( $parent->_wp_attachment_image_alt ),
);
}
$attachment['post_parent'] = $parent_attachment_id;
return $attachment;
}
/**
* Generates attachment meta data and create image sub-sizes for images.
*
* @since 2.1.0
* @since 6.0.0 The `$filesize` value was added to the returned array.
*
* @param int $attachment_id Attachment ID to process.
* @param string $file Filepath of the attached image.
* @return array Metadata for attachment.
*/
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 ) ) {
// Make thumbnails and other intermediate sizes.
$metadata = wp_create_image_subsizes( $file, $attachment_id );
} 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' );
}
/*
* wp_read_video_metadata() and wp_read_audio_metadata() return `false`
* if the attachment does not exist in the local filesystem,
* so make sure to convert the value to an array.
*/
if ( ! is_array( $metadata ) ) {
$metadata = array();
}
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;
case 'image/webp':
$ext = '.webp';
break;
}
$basename = str_replace( '.', '-', wp_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 3.9.0
*
* @param array $image_attachment An array of parameters to create the thumbnail.
* @param array $metadata Current attachment metadata.
* @param array $uploaded {
* Information about the newly-uploaded file.
*
* @type string $file Filename of the newly-uploaded file.
* @type string $url URL of the uploaded file.
* @type string $type File type.
* }
*/
$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 );
}
}
} elseif ( 'application/pdf' === $mime_type ) {
// Try to create image thumbnails for PDFs.
$fallback_sizes = array(
'thumbnail',
'medium',
'large',
);
/**
* Filters the image sizes generated for non-image mime types.
*
* @since 4.7.0
*
* @param string[] $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 );
$registered_sizes = wp_get_registered_image_subsizes();
$merged_sizes = array_intersect_key( $registered_sizes, array_flip( $fallback_sizes ) );
// Force thumbnails to be soft crops.
if ( isset( $merged_sizes['thumbnail'] ) && is_array( $merged_sizes['thumbnail'] ) ) {
$merged_sizes['thumbnail']['crop'] = false;
}
// Only load PDFs in an image editor if we're processing sizes.
if ( ! empty( $merged_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 ) ) {
$image_file = $uploaded['path'];
unset( $uploaded['path'] );
$metadata['sizes'] = array(
'full' => $uploaded,
);
// Save the meta data before any image post-processing errors could happen.
wp_update_attachment_metadata( $attachment_id, $metadata );
// Create sub-sizes saving the image meta after each.
$metadata = _wp_make_subsizes( $merged_sizes, $image_file, $metadata, $attachment_id );
}
}
}
}
// Remove the blob of binary data from the array.
unset( $metadata['image']['data'] );
// Capture file size for cases where it has not been captured yet, such as PDFs.
if ( ! isset( $metadata['filesize'] ) && file_exists( $file ) ) {
$metadata['filesize'] = wp_filesize( $file );
}
/**
* Filters the generated attachment meta data.
*
* @since 2.1.0
* @since 5.3.0 The `$context` parameter was added.
*
* @param array $metadata An array of attachment meta data.
* @param int $attachment_id Current attachment ID.
* @param string $context Additional context. Can be 'create' when metadata was initially created for new attachment
* or 'update' when the metadata was updated.
*/
return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'create' );
}
/**
* Converts a fraction string to a decimal.
*
* @since 2.5.0
*
* @param string $str Fraction string.
* @return int|float Returns calculated fraction or integer 0 on invalid input.
*/
function wp_exif_frac2dec( $str ) {
if ( ! is_scalar( $str ) || is_bool( $str ) ) {
return 0;
}
if ( ! is_string( $str ) ) {
return $str; // This can only be an integer or float, so this is fine.
}
// Fractions passed as a string must contain a single `/`.
if ( substr_count( $str, '/' ) !== 1 ) {
if ( is_numeric( $str ) ) {
return (float) $str;
}
return 0;
}
list( $numerator, $denominator ) = explode( '/', $str );
// Both the numerator and the denominator must be numbers.
if ( ! is_numeric( $numerator ) || ! is_numeric( $denominator ) ) {
return 0;
}
// The denominator must not be zero.
if ( 0 == $denominator ) { // phpcs:ignore Universal.Operators.StrictComparisons.LooseEqual -- Deliberate loose comparison.
return 0;
}
return $numerator / $denominator;
}
/**
* Converts the exif date format to a unix timestamp.
*
* @since 2.5.0
*
* @param string $str A date string expected to be in Exif format (Y:m:d H:i:s).
* @return int|false The unix timestamp, or false on failure.
*/
function wp_exif_date2ts( $str ) {
list( $date, $time ) = explode( ' ', trim( $str ) );
list( $y, $m, $d ) = explode( ':', $date );
return strtotime( "{$y}-{$m}-{$d} {$time}" );
}
/**
* Gets extended image metadata, exif or iptc as available.
*
* Retrieves the EXIF metadata aperture, credit, camera, caption, copyright, iso
* created_timestamp, focal_length, shutter_speed, and title.
*
* The IPTC metadata that is retrieved is APP13, credit, byline, created date
* and time, caption, copyright, and title. Also includes FNumber, Model,
* DateTimeDigitized, FocalLength, ISOSpeedRatings, and ExposureTime.
*
* @todo Try other exif libraries if available.
* @since 2.5.0
*
* @param string $file
* @return array|false Image metadata array on success, false on failure.
*/
function wp_read_image_metadata( $file ) {
if ( ! file_exists( $file ) ) {
return false;
}
list( , , $image_type ) = wp_getimagesize( $file );
/*
* EXIF contains a bunch of data we'll probably never need formatted in ways
* that are difficult to use. We'll normalize it and just extract the fields
* that are likely to be useful. Fractions and numbers are converted to
* floats, dates to unix timestamps, and everything else to strings.
*/
$meta = array(
'aperture' => 0,
'credit' => '',
'camera' => '',
'caption' => '',
'created_timestamp' => 0,
'copyright' => '',
'focal_length' => 0,
'iso' => 0,
'shutter_speed' => 0,
'title' => '',
'orientation' => 0,
'keywords' => array(),
);
$iptc = array();
$info = array();
/*
* Read IPTC first, since it might contain data not available in exif such
* as caption, description etc.
*/
if ( is_callable( 'iptcparse' ) ) {
wp_getimagesize( $file, $info );
if ( ! empty( $info['APP13'] ) ) {
// Don't silence errors when in debug mode, unless running unit tests.
if ( defined( 'WP_DEBUG' ) && WP_DEBUG
&& ! defined( 'WP_RUN_CORE_TESTS' )
) {
$iptc = iptcparse( $info['APP13'] );
} else {
// Silencing notice and warning is intentional. See https://core.trac.wordpress.org/ticket/42480
$iptc = @iptcparse( $info['APP13'] );
}
if ( ! is_array( $iptc ) ) {
$iptc = array();
}
// Headline, "A brief synopsis of the caption".
if ( ! empty( $iptc['2#105'][0] ) ) {
$meta['title'] = trim( $iptc['2#105'][0] );
/*
* Title, "Many use the Title field to store the filename of the image,
* though the field may be used in many ways".
*/
} elseif ( ! empty( $iptc['2#005'][0] ) ) {
$meta['title'] = trim( $iptc['2#005'][0] );
}
if ( ! empty( $iptc['2#120'][0] ) ) { // Description / legacy caption.
$caption = trim( $iptc['2#120'][0] );
mbstring_binary_safe_encoding();
$caption_length = strlen( $caption );
reset_mbstring_encoding();
if ( empty( $meta['title'] ) && $caption_length < 80 ) {
// Assume the title is stored in 2:120 if it's short.
$meta['title'] = $caption;
}
$meta['caption'] = $caption;
}
if ( ! empty( $iptc['2#110'][0] ) ) { // Credit.
$meta['credit'] = trim( $iptc['2#110'][0] );
} elseif ( ! empty( $iptc['2#080'][0] ) ) { // Creator / legacy byline.
$meta['credit'] = trim( $iptc['2#080'][0] );
}
if ( ! empty( $iptc['2#055'][0] ) && ! empty( $iptc['2#060'][0] ) ) { // Created date and time.
$meta['created_timestamp'] = strtotime( $iptc['2#055'][0] . ' ' . $iptc['2#060'][0] );
}
if ( ! empty( $iptc['2#116'][0] ) ) { // Copyright.
$meta['copyright'] = trim( $iptc['2#116'][0] );
}
if ( ! empty( $iptc['2#025'][0] ) ) { // Keywords array.
$meta['keywords'] = array_values( $iptc['2#025'] );
}
}
}
$exif = array();
/**
* Filters the image types to check for exif data.
*
* @since 2.5.0
*
* @param int[] $image_types Array of image types to check for exif data. Each value
* is usually one of the `IMAGETYPE_*` constants.
*/
$exif_image_types = apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) );
if ( is_callable( 'exif_read_data' ) && in_array( $image_type, $exif_image_types, true ) ) {
// Don't silence errors when in debug mode, unless running unit tests.
if ( defined( 'WP_DEBUG' ) && WP_DEBUG
&& ! defined( 'WP_RUN_CORE_TESTS' )
) {
$exif = exif_read_data( $file );
} else {
// Silencing notice and warning is intentional. See https://core.trac.wordpress.org/ticket/42480
$exif = @exif_read_data( $file );
}
if ( ! is_array( $exif ) ) {
$exif = array();
}
$exif_description = '';
$exif_usercomment = '';
if ( ! empty( $exif['ImageDescription'] ) ) {
$exif_description = trim( $exif['ImageDescription'] );
}
if ( ! empty( $exif['COMPUTED']['UserComment'] ) ) {
$exif_usercomment = trim( $exif['COMPUTED']['UserComment'] );
}
if ( $exif_description ) {
mbstring_binary_safe_encoding();
$description_length = strlen( $exif_description );
reset_mbstring_encoding();
if ( empty( $meta['title'] ) && $description_length < 80 ) {
// Assume the title is stored in ImageDescription.
$meta['title'] = $exif_description;
}
// If both user comments and description are present.
if ( empty( $meta['caption'] ) && $exif_description && $exif_usercomment ) {
if ( ! empty( $meta['title'] ) && $exif_description === $meta['title'] ) {
$caption = $exif_usercomment;
} else {
if ( $exif_description === $exif_usercomment ) {
$caption = $exif_description;
} else {
$caption = trim( $exif_description . ' ' . $exif_usercomment );
}
}
$meta['caption'] = $caption;
}
if ( empty( $meta['caption'] ) && $exif_usercomment ) {
$meta['caption'] = $exif_usercomment;
}
if ( empty( $meta['caption'] ) ) {
$meta['caption'] = $exif_description;
}
} elseif ( empty( $meta['caption'] ) && $exif_usercomment ) {
$meta['caption'] = $exif_usercomment;
$description_length = strlen( $exif_usercomment );
if ( empty( $meta['title'] ) && $description_length < 80 ) {
$meta['title'] = trim( $exif_usercomment );
}
} elseif ( empty( $meta['caption'] ) && ! empty( $exif['Comments'] ) ) {
$meta['caption'] = trim( $exif['Comments'] );
}
if ( empty( $meta['credit'] ) ) {
if ( ! empty( $exif['Artist'] ) ) {
$meta['credit'] = trim( $exif['Artist'] );
} elseif ( ! empty( $exif['Author'] ) ) {
$meta['credit'] = trim( $exif['Author'] );
}
}
if ( empty( $meta['copyright'] ) && ! empty( $exif['Copyright'] ) ) {
$meta['copyright'] = trim( $exif['Copyright'] );
}
if ( ! empty( $exif['FNumber'] ) && is_scalar( $exif['FNumber'] ) ) {
$meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
}
if ( ! empty( $exif['Model'] ) ) {
$meta['camera'] = trim( $exif['Model'] );
}
if ( empty( $meta['created_timestamp'] ) && ! empty( $exif['DateTimeDigitized'] ) ) {
$meta['created_timestamp'] = wp_exif_date2ts( $exif['DateTimeDigitized'] );
}
if ( ! empty( $exif['FocalLength'] ) ) {
$meta['focal_length'] = (string) $exif['FocalLength'];
if ( is_scalar( $exif['FocalLength'] ) ) {
$meta['focal_length'] = (string) wp_exif_frac2dec( $exif['FocalLength'] );
}
}
if ( ! empty( $exif['ISOSpeedRatings'] ) ) {
$meta['iso'] = is_array( $exif['ISOSpeedRatings'] ) ? reset( $exif['ISOSpeedRatings'] ) : $exif['ISOSpeedRatings'];
$meta['iso'] = trim( $meta['iso'] );