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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 |
|---|---|
| 261 | * @since 3.7.0 |
| 262 | * @since 5.5.0 Added the `$hook_extra` parameter. |
| 263 | * |
| 264 | * @param bool $reply Whether to bail without returning the package. |
| 265 | * Default false. |
| 266 | * @param string $package The package file name. |
| 267 | * @param WP_Upgrader $upgrader The WP_Upgrader instance. |
| 268 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 269 | */ |
| 270 | $reply = apply_filters( 'upgrader_pre_download', false, $package, $this, $hook_extra ); |
| 271 | if ( false !== $reply ) { |
| 272 | return $reply; |
| 273 | } |
| 274 | |
| 275 | if ( ! preg_match( '!^(http|https|ftp)://!i', $package ) && file_exists( $package ) ) { // Local file or remote? |
| 276 | return $package; // Must be a local file. |
| 277 | } |
| 278 | |
| 279 | if ( empty( $package ) ) { |