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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 |
---|---|
297 | /** |
298 | * Filter default mime type prior to getting the file extension. |
299 | * |
300 | * @see wp_get_mime_types() |
301 | * |
302 | * @since 3.5.0 |
303 | * |
304 | * @param string $mime_type Mime type string. |
305 | */ |
306 | $mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type ); |
307 | $new_ext = $this->get_extension( $mime_type ); |
308 | } |
309 |
|
310 | if ( $filename ) { |
311 | $ext = ''; |
312 | $info = pathinfo( $filename ); |
313 | $dir = $info['dirname']; |
314 |
|
315 | if( isset( $info['extension'] ) ) |