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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 |
|---|---|
| 228 | $meta['caption'] = trim( $iptc['2#120'][0] ); |
| 229 | if ( !empty($iptc['2#116'][0]) ) // copyright |
| 230 | $meta['copyright'] = trim( $iptc['2#116'][0] ); |
| 231 | if ( !empty($iptc['2#005'][0]) ) // title |
| 232 | $meta['title'] = trim( $iptc['2#005'][0] ); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | // fetch additional info from exif if available |
| 237 | if ( is_callable('exif_read_data') && in_array($sourceImageType, apply_filters('wp_read_image_metadata_types', array(IMAGETYPE_JPEG, IMAGETYPE_TIFF_II, IMAGETYPE_TIFF_MM)) ) ) { |
| 238 | $exif = exif_read_data( $file ); |
| 239 | if (!empty($exif['FNumber'])) |
| 240 | $meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 ); |
| 241 | if (!empty($exif['Model'])) |
| 242 | $meta['camera'] = trim( $exif['Model'] ); |
| 243 | if (!empty($exif['DateTimeDigitized'])) |
| 244 | $meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']); |
| 245 | if (!empty($exif['FocalLength'])) |
| 246 | $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] ); |