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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 |
|---|---|
| 223 | if ( ! empty( $iptc['2#055'][0] ) and ! empty( $iptc['2#060'][0] ) ) // created date and time |
| 224 | $meta['created_timestamp'] = strtotime( $iptc['2#055'][0] . ' ' . $iptc['2#060'][0] ); |
| 225 | |
| 226 | if ( ! empty( $iptc['2#116'][0] ) ) // copyright |
| 227 | $meta['copyright'] = trim( $iptc['2#116'][0] ); |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | // fetch additional info from exif if available |
| 232 | 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 ) ) ) ) { |
| 233 | $exif = @exif_read_data( $file ); |
| 234 | |
| 235 | if ( !empty( $exif['Title'] ) ) |
| 236 | $meta['title'] = trim( $exif['Title'] ); |
| 237 | |
| 238 | if ( ! empty( $exif['ImageDescription'] ) ) { |
| 239 | if ( empty( $meta['title'] ) && strlen( $exif['ImageDescription'] ) < 80 ) { |
| 240 | // Assume the title is stored in ImageDescription |
| 241 | $meta['title'] = trim( $exif['ImageDescription'] ); |