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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 |
|---|---|
| 1109 | $url .= $subdir; |
| 1110 | |
| 1111 | // Make sure we have an uploads dir |
| 1112 | if ( ! wp_mkdir_p( $dir ) ) { |
| 1113 | $message = sprintf( __( 'Unable to create directory %s. Is its parent directory writable by the server?' ), $dir ); |
| 1114 | return array( 'error' => $message ); |
| 1115 | } |
| 1116 | |
| 1117 | $uploads = array( 'path' => $dir, 'url' => $url, 'subdir' => $subdir, 'error' => false ); |
| 1118 | return apply_filters( 'upload_dir', $uploads ); |
| 1119 | } |
| 1120 | |
| 1121 | // return a filename that is sanitized and unique for the given directory |
| 1122 | function wp_unique_filename( $dir, $filename, $unique_filename_callback = NULL ) { |
| 1123 | $filename = strtolower( $filename ); |
| 1124 | // separate the filename into a name and extension |
| 1125 | $info = pathinfo($filename); |
| 1126 | $ext = $info['extension']; |
| 1127 | $name = basename($filename, ".{$ext}"); |