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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 |
|---|---|
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Filter the image types to check for exif data. |
| 317 | * |
| 318 | * @since 2.5.0 |
| 319 | * |
| 320 | * @param array $image_types Image types to check for exif data. |
| 321 | */ |
| 322 | 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 ) ) ) ) { |
| 323 | $exif = @exif_read_data( $file ); |
| 324 | |
| 325 | if ( !empty( $exif['Title'] ) ) |
| 326 | $meta['title'] = trim( $exif['Title'] ); |
| 327 | |
| 328 | if ( ! empty( $exif['ImageDescription'] ) ) { |
| 329 | if ( empty( $meta['title'] ) && strlen( $exif['ImageDescription'] ) < 80 ) { |
| 330 | // Assume the title is stored in ImageDescription |
| 331 | $meta['title'] = trim( $exif['ImageDescription'] ); |