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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 |
|---|---|
| 918 | } |
| 919 | |
| 920 | // Make sure we have an uploads dir |
| 921 | if ( ! wp_mkdir_p( $dir ) ) { |
| 922 | $message = sprintf(__('Unable to create directory %s. Is its parent directory writable by the server?'), $dir); |
| 923 | return array('error' => $message); |
| 924 | } |
| 925 | |
| 926 | $uploads = array('path' => $dir, 'url' => $url, 'error' => false); |
| 927 | return apply_filters('upload_dir', $uploads); |
| 928 | } |
| 929 | |
| 930 | function wp_upload_bits($name, $type, $bits) { |
| 931 | if ( empty($name) ) |
| 932 | return array('error' => __("Empty filename")); |
| 933 | |
| 934 | $wp_filetype = wp_check_filetype($name); |
| 935 | if ( !$wp_filetype['ext'] ) |
| 936 | return array('error' => __("Invalid file type")); |