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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 |
|---|---|
| 441 | $exif = array(); |
| 442 | |
| 443 | /** |
| 444 | * Filters the image types to check for exif data. |
| 445 | * |
| 446 | * @since 2.5.0 |
| 447 | * |
| 448 | * @param array $image_types Image types to check for exif data. |
| 449 | */ |
| 450 | $exif_image_types = apply_filters( 'wp_read_image_metadata_types', array( IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM ) ); |
| 451 | |
| 452 | if ( is_callable( 'exif_read_data' ) && in_array( $image_type, $exif_image_types ) ) { |
| 453 | $exif = @exif_read_data( $file ); |
| 454 | |
| 455 | if ( ! empty( $exif['ImageDescription'] ) ) { |
| 456 | mbstring_binary_safe_encoding(); |
| 457 | $description_length = strlen( $exif['ImageDescription'] ); |
| 458 | reset_mbstring_encoding(); |
| 459 | |