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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 |
|---|---|
| 384 | case 'site_users_network_per_page': |
| 385 | case 'plugins_network_per_page': |
| 386 | case 'themes_network_per_page': |
| 387 | case 'site_themes_network_per_page': |
| 388 | $value = (int) $value; |
| 389 | if ( $value < 1 || $value > 999 ) |
| 390 | return; |
| 391 | break; |
| 392 | default: |
| 393 | $value = apply_filters('set-screen-option', false, $option, $value); |
| 394 | if ( false === $value ) |
| 395 | return; |
| 396 | break; |
| 397 | } |
| 398 | |
| 399 | update_user_meta($user->ID, $option, $value); |
| 400 | wp_safe_redirect( remove_query_arg( array('pagenum', 'apage', 'paged'), wp_get_referer() ) ); |
| 401 | exit; |
| 402 | } |