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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 |
|---|---|
| 245 | if (!empty($exif['FocalLength'])) |
| 246 | $meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] ); |
| 247 | if (!empty($exif['ISOSpeedRatings'])) |
| 248 | $meta['iso'] = $exif['ISOSpeedRatings']; |
| 249 | if (!empty($exif['ExposureTime'])) |
| 250 | $meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] ); |
| 251 | } |
| 252 | // FIXME: try other exif libraries if available |
| 253 | |
| 254 | return apply_filters( 'wp_read_image_metadata', $meta, $file, $sourceImageType ); |
| 255 | |
| 256 | } |
| 257 | |
| 258 | // is the file a real image file? |
| 259 | function file_is_valid_image($path) { |
| 260 | $size = @getimagesize($path); |
| 261 | return !empty($size); |
| 262 | } |
| 263 | |