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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 |
|---|---|
| 1005 | } |
| 1006 | |
| 1007 | // Make sure we have an uploads dir |
| 1008 | if ( ! wp_mkdir_p( $dir ) ) { |
| 1009 | $message = sprintf(__('Unable to create directory %s. Is its parent directory writable by the server?'), $dir); |
| 1010 | return array('error' => $message); |
| 1011 | } |
| 1012 | |
| 1013 | $uploads = array('path' => $dir, 'url' => $url, 'error' => false); |
| 1014 | return apply_filters('upload_dir', $uploads); |
| 1015 | } |
| 1016 | |
| 1017 | function wp_upload_bits($name, $type, $bits) { |
| 1018 | if ( empty($name) ) |
| 1019 | return array('error' => __("Empty filename")); |
| 1020 | |
| 1021 | $wp_filetype = wp_check_filetype($name); |
| 1022 | if ( !$wp_filetype['ext'] ) |
| 1023 | return array('error' => __("Invalid file type")); |