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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 |
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327 | } |
328 |
|
329 | /** |
330 | * Filter the image types to check for exif data. |
331 | * |
332 | * @since 2.5.0 |
333 | * |
334 | * @param array $image_types Image types to check for exif data. |
335 | */ |
336 | 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 ) ) ) ) { |
337 | $exif = @exif_read_data( $file ); |
338 |
|
339 | if ( ! empty( $exif['ImageDescription'] ) ) { |
340 | mbstring_binary_safe_encoding(); |
341 | $description_length = strlen( $exif['ImageDescription'] ); |
342 | reset_mbstring_encoding(); |
343 |
|
344 | if ( empty( $meta['title'] ) && $description_length < 80 ) { |
345 | // Assume the title is stored in ImageDescription |