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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 |
|---|---|
| 216 | * Filter whether to return the package. |
| 217 | * |
| 218 | * @since 3.7.0 |
| 219 | * |
| 220 | * @param bool $reply Whether to bail without returning the package. |
| 221 | * Default false. |
| 222 | * @param string $package The package file name. |
| 223 | * @param WP_Upgrader $this The WP_Upgrader instance. |
| 224 | */ |
| 225 | $reply = apply_filters( 'upgrader_pre_download', false, $package, $this ); |
| 226 | if ( false !== $reply ) |
| 227 | return $reply; |
| 228 | |
| 229 | if ( ! preg_match('!^(http|https|ftp)://!i', $package) && file_exists($package) ) //Local file or remote? |
| 230 | return $package; //must be a local file.. |
| 231 | |
| 232 | if ( empty($package) ) |
| 233 | return new WP_Error('no_package', $this->strings['no_package']); |
| 234 | |