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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 |
|---|---|
| 255 | * Filters whether to return the package. |
| 256 | * |
| 257 | * @since 3.7.0 |
| 258 | * |
| 259 | * @param bool $reply Whether to bail without returning the package. |
| 260 | * Default false. |
| 261 | * @param string $package The package file name. |
| 262 | * @param WP_Upgrader $this The WP_Upgrader instance. |
| 263 | */ |
| 264 | $reply = apply_filters( 'upgrader_pre_download', false, $package, $this ); |
| 265 | if ( false !== $reply ) { |
| 266 | return $reply; |
| 267 | } |
| 268 | |
| 269 | if ( ! preg_match( '!^(http|https|ftp)://!i', $package ) && file_exists( $package ) ) { //Local file or remote? |
| 270 | return $package; //must be a local file.. |
| 271 | } |
| 272 | |
| 273 | if ( empty( $package ) ) { |