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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 |
|---|---|
| 369 | * @param string[] $output_format { |
| 370 | * An array of mime type mappings. Maps a source mime type to a new |
| 371 | * destination mime type. Default empty array. |
| 372 | * |
| 373 | * @type string ...$0 The new mime type. |
| 374 | * } |
| 375 | * @param string $filename Path to the image. |
| 376 | * @param string $mime_type The source image mime type. |
| 377 | */ |
| 378 | $output_format = apply_filters( 'image_editor_output_format', array(), $filename, $mime_type ); |
| 379 | |
| 380 | if ( isset( $output_format[ $mime_type ] ) |
| 381 | && $this->supports_mime_type( $output_format[ $mime_type ] ) |
| 382 | ) { |
| 383 | $mime_type = $output_format[ $mime_type ]; |
| 384 | $new_ext = $this->get_extension( $mime_type ); |
| 385 | } |
| 386 | |
| 387 | // Double-check that the mime-type selected is supported by the editor. |