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