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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 |
---|---|
322 | /** |
323 | * Filters default mime type prior to getting the file extension. |
324 | * |
325 | * @see wp_get_mime_types() |
326 | * |
327 | * @since 3.5.0 |
328 | * |
329 | * @param string $mime_type Mime type string. |
330 | */ |
331 | $mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type ); |
332 | $new_ext = $this->get_extension( $mime_type ); |
333 | } |
334 |
|
335 | if ( $filename ) { |
336 | $dir = pathinfo( $filename, PATHINFO_DIRNAME ); |
337 | $ext = pathinfo( $filename, PATHINFO_EXTENSION ); |
338 |
|
339 | $filename = trailingslashit( $dir ) . wp_basename( $filename, ".$ext" ) . ".{$new_ext}"; |
340 | } |