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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 | 
|---|---|
| 306 |                // Send to moderation. | 
| 307 |                self::$last_comment_result = '0'; | 
| 308 |           } | 
| 309 |           else if ( 'true' == $response[1] ) { | 
| 310 |                // akismet_spam_count will be incremented later by comment_is_spam() | 
| 311 |                self::$last_comment_result = 'spam'; | 
| 312 |  | 
| 313 |                $discard = ( isset( $commentdata['akismet_pro_tip'] ) && $commentdata['akismet_pro_tip'] === 'discard' && self::allow_discard() ); | 
| 314 |  | 
| 315 |                do_action( 'akismet_spam_caught', $discard ); | 
| 316 |  | 
| 317 |                if ( $discard ) { | 
| 318 |                     // The spam is obvious, so we're bailing out early.  | 
| 319 |                     // akismet_result_spam() won't be called so bump the counter here | 
| 320 |                     if ( $incr = apply_filters( 'akismet_spam_count_incr', 1 ) ) { | 
| 321 |                          update_option( 'akismet_spam_count', get_option( 'akismet_spam_count' ) + $incr ); | 
| 322 |                     } | 
| 323 |  | 
| 324 |                     if ( 'rest_api' === $context ) { |