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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 | 
|---|---|
| 538 |      if ( $pref == 'spam' ) { | 
| 539 |           if ( $value == 1 ) { | 
| 540 |                /** | 
| 541 |                 * Fires after the user is marked as a SPAM user. | 
| 542 |                 * | 
| 543 |                 * @since 3.0.0 | 
| 544 |                 * | 
| 545 |                 * @param int $id ID of the user marked as SPAM. | 
| 546 |                 */ | 
| 547 |                do_action( 'make_spam_user', $id ); | 
| 548 |           } else { | 
| 549 |                /** | 
| 550 |                 * Fires after the user is marked as a HAM user. Opposite of SPAM. | 
| 551 |                 * | 
| 552 |                 * @since 3.0.0 | 
| 553 |                 * | 
| 554 |                 * @param int $id ID of the user marked as HAM. | 
| 555 |                 */ | 
| 556 |                do_action( 'make_ham_user', $id ); |