apply_filters( 'default_excerpt', string $post_excerpt, WP_Post $post )
Filters the default post excerpt initially used in the “Write Post” form.
Parameters
- $post_excerpt
-  (string) Default post excerpt. 
- $post
-  (WP_Post) Post object. 
Source
Changelog
| Version | Description | 
|---|---|
| 1.5.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/hooks/default_excerpt