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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 |
---|---|
315 | /** |
316 | * Filter default mime type prior to getting the file extension. |
317 | * |
318 | * @see wp_get_mime_types() |
319 | * |
320 | * @since 3.5.0 |
321 | * |
322 | * @param string $mime_type Mime type string. |
323 | */ |
324 | $mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type ); |
325 | $new_ext = $this->get_extension( $mime_type ); |
326 | } |
327 |
|
328 | if ( $filename ) { |
329 | $ext = ''; |
330 | $info = pathinfo( $filename ); |
331 | $dir = $info['dirname']; |
332 |
|
333 | if( isset( $info['extension'] ) ) |