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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 | 
|---|---|
| 3896 |  | 
| 3897 |      if ( '' === trim( $text ) ) { | 
| 3898 |           $post = get_post( $post ); | 
| 3899 |           $text = get_the_content( '', false, $post ); | 
| 3900 |  | 
| 3901 |           $text = strip_shortcodes( $text ); | 
| 3902 |           $text = excerpt_remove_blocks( $text ); | 
| 3903 |  | 
| 3904 |           /** This filter is documented in wp-includes/post-template.php */ | 
| 3905 |           $text = apply_filters( 'the_content', $text ); | 
| 3906 |           $text = str_replace( ']]>', ']]>', $text ); | 
| 3907 |  | 
| 3908 |           /* translators: Maximum number of words used in a post excerpt. */ | 
| 3909 |           $excerpt_length = (int) _x( '55', 'excerpt_length' ); | 
| 3910 |  | 
| 3911 |           /** | 
| 3912 |            * Filters the maximum number of words in a post excerpt. | 
| 3913 |            * | 
| 3914 |            * @since 2.7.0 |