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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 |
|---|---|
| 270 | // only gif, jpeg and png images can reliably be displayed |
| 271 | $result = false; |
| 272 | elseif ( $info['channels'] > 0 && $info['channels'] != 3 ) { |
| 273 | // some web browsers can't display cmyk or grayscale jpegs |
| 274 | $result = false; |
| 275 | } |
| 276 | else |
| 277 | $result = true; |
| 278 | |
| 279 | return apply_filters('file_is_displayable_image', $result, $path); |
| 280 | } |
| 281 | |
| 282 | ?> |
| 283 | |