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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 337 | } |
| 338 | |
| 339 | /** |
| 340 | * Filter the image types to check for exif data. |
| 341 | * |
| 342 | * @since 2.5.0 |
| 343 | * |
| 344 | * @param array $image_types Image types to check for exif data. |
| 345 | */ |
| 346 | if ( is_callable( 'exif_read_data' ) && in_array( $sourceImageType, apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) ) ) ) { |
| 347 | $exif = @exif_read_data( $file ); |
| 348 | |
| 349 | if ( ! empty( $exif['ImageDescription'] ) ) { |
| 350 | mbstring_binary_safe_encoding(); |
| 351 | $description_length = strlen( $exif['ImageDescription'] ); |
| 352 | reset_mbstring_encoding(); |
| 353 | |
| 354 | if ( empty( $meta['title'] ) && $description_length < 80 ) { |
| 355 | // Assume the title is stored in ImageDescription |