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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 |
|---|---|
| 310 | if ( ! empty($exif['ExposureTime'] ) ) |
| 311 | $meta['shutter_speed'] = (string) wp_exif_frac2dec( $exif['ExposureTime'] ); |
| 312 | } |
| 313 | |
| 314 | foreach ( array( 'title', 'caption', 'credit', 'copyright', 'camera', 'iso' ) as $key ) { |
| 315 | if ( $meta[ $key ] && ! seems_utf8( $meta[ $key ] ) ) |
| 316 | $meta[ $key ] = utf8_encode( $meta[ $key ] ); |
| 317 | } |
| 318 | |
| 319 | return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType ); |
| 320 | |
| 321 | } |
| 322 | |
| 323 | /** |
| 324 | * Validate that file is an image. |
| 325 | * |
| 326 | * @since 2.5.0 |
| 327 | * |
| 328 | * @param string $path File path to test if valid image. |