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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 |
|---|---|
| 35 | // 0 => tab display name, 1 => required cap, 2 => function that produces tab content, 3 => total number objects OR array(total, objects per page), 4 => add_query_args |
| 36 | $wp_upload_tabs['upload'] = array(__('Upload'), 'upload_files', 'wp_upload_tab_upload', 0); |
| 37 | if ( $all_atts && $post_atts = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = '$post_id'") ) |
| 38 | $wp_upload_tabs['browse'] = array(__('Browse'), 'upload_files', "wp_upload_tab_browse", $action ? 0 : $post_atts); |
| 39 | if ( $post_atts < $all_atts ) |
| 40 | $wp_upload_tabs['browse-all'] = array(__('Browse All'), 'upload_files', 'wp_upload_tab_browse', $action ? 0 : $all_atts); |
| 41 | } else |
| 42 | $wp_upload_tabs['browse-all'] = array(__('Browse All'), 'upload_files', 'wp_upload_tab_browse', $action ? 0 : $all_atts); |
| 43 | |
| 44 | $wp_upload_tabs = array_merge($wp_upload_tabs, apply_filters( 'wp_upload_tabs', array() )); |
| 45 | |
| 46 | if ( !is_callable($wp_upload_tabs[$tab][2]) ) { |
| 47 | $to_tab = isset($wp_upload_tabs['upload']) ? 'upload' : 'browse-all'; |
| 48 | wp_redirect( add_query_arg( 'tab', $to_tab ) ); |
| 49 | exit; |
| 50 | } |
| 51 | |
| 52 | foreach ( $wp_upload_tabs as $t => $tab_array ) { |
| 53 | if ( !current_user_can( $tab_array[1] ) ) { |