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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 |
|---|---|
| 223 | */ |
| 224 | function wp_handle_upload( &$file, $overrides = false, $time = null ) { |
| 225 | // The default error handler. |
| 226 | if (! function_exists( 'wp_handle_upload_error' ) ) { |
| 227 | function wp_handle_upload_error( &$file, $message ) { |
| 228 | return array( 'error'=>$message ); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | $file = apply_filters( 'wp_handle_upload_prefilter', $file ); |
| 233 | |
| 234 | // You may define your own function and pass the name in $overrides['upload_error_handler'] |
| 235 | $upload_error_handler = 'wp_handle_upload_error'; |
| 236 | |
| 237 | // You may have had one or more 'wp_handle_upload_prefilter' functions error out the file. Handle that gracefully. |
| 238 | if ( isset( $file['error'] ) && !ctype_digit( $file['error'] ) && $file['error'] ) |
| 239 | return $upload_error_handler( $file, $file['error'] ); |
| 240 | |
| 241 | // You may define your own function and pass the name in $overrides['unique_filename_callback'] |