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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 |
---|---|
1216 | $per_page = apply_filters( 'edit_categories_per_page', $per_page ); |
1217 | } else { |
1218 | /** This filter is documented in wp-admin/includes/class-wp-list-table.php */ |
1219 | $per_page = apply_filters( "{$option}", $per_page ); |
1220 | } |
1221 |
|
1222 | // Back compat |
1223 | if ( isset( $this->post_type ) ) { |
1224 | /** This filter is documented in wp-admin/includes/post.php */ |
1225 | $per_page = apply_filters( 'edit_posts_per_page', $per_page, $this->post_type ); |
1226 | } |
1227 |
|
1228 | // This needs a submit button |
1229 | add_filter( 'screen_options_show_submit', '__return_true' ); |
1230 |
|
1231 | ?> |
1232 | <fieldset class="screen-options"> |
1233 | <legend><?php _e( 'Pagination' ); ?></legend> |
1234 | <?php if ( $per_page_label ) : ?> |