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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 |
|---|---|
| 248 | * Filter the data for a file before it is uploaded to WordPress. |
| 249 | * |
| 250 | * The dynamic portion of the hook name, `$action`, refers to the post action. |
| 251 | * |
| 252 | * @since 2.9.0 as 'wp_handle_upload_prefilter'. |
| 253 | * @since 4.0.0 Converted to a dynamic hook with `$action`. |
| 254 | * |
| 255 | * @param array $file An array of data for a single file. |
| 256 | */ |
| 257 | $file = apply_filters( "{$action}_prefilter", $file ); |
| 258 | |
| 259 | // You may define your own function and pass the name in $overrides['upload_error_handler'] |
| 260 | $upload_error_handler = 'wp_handle_upload_error'; |
| 261 | if ( isset( $overrides['upload_error_handler'] ) ) { |
| 262 | $upload_error_handler = $overrides['upload_error_handler']; |
| 263 | } |
| 264 | |
| 265 | // You may have had one or more 'wp_handle_upload_prefilter' functions error out the file. Handle that gracefully. |
| 266 | if ( isset( $file['error'] ) && ! is_numeric( $file['error'] ) && $file['error'] ) { |