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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 |
|---|---|
| 402 | case 'upload_per_page': |
| 403 | case 'categories_per_page': |
| 404 | case 'edit_tags_per_page': |
| 405 | case 'plugins_per_page': |
| 406 | $value = (int) $value; |
| 407 | if ( $value < 1 || $value > 999 ) |
| 408 | return; |
| 409 | break; |
| 410 | default: |
| 411 | $value = apply_filters('set-screen-option', false, $option, $value); |
| 412 | if ( false === $value ) |
| 413 | return; |
| 414 | break; |
| 415 | } |
| 416 | |
| 417 | update_usermeta($user->ID, $option, $value); |
| 418 | wp_redirect( remove_query_arg( array('pagenum', 'apage', 'paged'), wp_get_referer() ) ); |
| 419 | exit; |
| 420 | } |