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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 |
|---|---|
| 305 | function file_is_displayable_image($path) { |
| 306 | $info = @getimagesize($path); |
| 307 | if ( empty($info) ) |
| 308 | $result = false; |
| 309 | elseif ( !in_array($info[2], array(IMAGETYPE_GIF, IMAGETYPE_JPEG, IMAGETYPE_PNG)) ) // only gif, jpeg and png images can reliably be displayed |
| 310 | $result = false; |
| 311 | else |
| 312 | $result = true; |
| 313 | |
| 314 | return apply_filters('file_is_displayable_image', $result, $path); |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * Load an image resource for editing. |
| 319 | * |
| 320 | * @since 2.9.0 |
| 321 | * |
| 322 | * @param string $attachment_id Attachment ID. |
| 323 | * @param string $mime_type Image mime type. |