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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 |
|---|---|
| 283 | $meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']); |
| 284 | if (!empty($exif['FocalLength'])) |
| 285 | $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] ); |
| 286 | if (!empty($exif['ISOSpeedRatings'])) |
| 287 | $meta['iso'] = $exif['ISOSpeedRatings']; |
| 288 | if (!empty($exif['ExposureTime'])) |
| 289 | $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] ); |
| 290 | } |
| 291 | |
| 292 | return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType ); |
| 293 | |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Validate that file is an image. |
| 298 | * |
| 299 | * @since 2.5.0 |
| 300 | * |
| 301 | * @param string $path File path to test if valid image. |