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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 |
|---|---|
| 333 | function file_is_displayable_image($path) { |
| 334 | $info = @getimagesize($path); |
| 335 | if ( empty($info) ) |
| 336 | $result = false; |
| 337 | elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) ) // only gif, jpeg and png images can reliably be displayed |
| 338 | $result = false; |
| 339 | else |
| 340 | $result = true; |
| 341 | |
| 342 | return apply_filters('file_is_displayable_image', $result, $path); |
| 343 | } |
| 344 | |