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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 |
|---|---|
| 321 | $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] ); |
| 322 | if ( ! empty($exif['ISOSpeedRatings'] ) ) { |
| 323 | $meta['iso'] = is_array( $exif['ISOSpeedRatings'] ) ? reset( $exif['ISOSpeedRatings'] ) : $exif['ISOSpeedRatings']; |
| 324 | $meta['iso'] = utf8_encode( trim( $meta['iso'] ) ); |
| 325 | } |
| 326 | if ( ! empty($exif['ExposureTime'] ) ) |
| 327 | $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] ); |
| 328 | } |
| 329 | |
| 330 | return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType ); |
| 331 | |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Validate that file is an image. |
| 336 | * |
| 337 | * @since 2.5.0 |
| 338 | * |
| 339 | * @param string $path File path to test if valid image. |