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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 |
---|---|
379 | /** |
380 | * Filters default mime type prior to getting the file extension. |
381 | * |
382 | * @see wp_get_mime_types() |
383 | * |
384 | * @since 3.5.0 |
385 | * |
386 | * @param string $mime_type Mime type string. |
387 | */ |
388 | $mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type ); |
389 | $new_ext = $this->get_extension( $mime_type ); |
390 | } |
391 |
|
392 | // Ensure both $filename and $new_ext are not empty. |
393 | // $this->get_extension() returns false on error which would effectively remove the extension |
394 | // from $filename. That shouldn't happen, files without extensions are not supported. |
395 | if ( $filename && $new_ext ) { |
396 | $dir = pathinfo( $filename, PATHINFO_DIRNAME ); |
397 | $ext = pathinfo( $filename, PATHINFO_EXTENSION ); |