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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 |
---|---|
1252 | $per_page = apply_filters( 'edit_categories_per_page', $per_page ); |
1253 | } else { |
1254 | /** This filter is documented in wp-admin/includes/class-wp-list-table.php */ |
1255 | $per_page = apply_filters( "{$option}", $per_page ); |
1256 | } |
1257 |
|
1258 | // Back compat. |
1259 | if ( isset( $this->post_type ) ) { |
1260 | /** This filter is documented in wp-admin/includes/post.php */ |
1261 | $per_page = apply_filters( 'edit_posts_per_page', $per_page, $this->post_type ); |
1262 | } |
1263 |
|
1264 | // This needs a submit button. |
1265 | add_filter( 'screen_options_show_submit', '__return_true' ); |
1266 |
|
1267 | ?> |
1268 | <fieldset class="screen-options"> |
1269 | <legend><?php _e( 'Pagination' ); ?></legend> |
1270 | <?php if ( $per_page_label ) : ?> |