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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 |
|---|---|
| 203 | * adjust core updates. |
| 204 | * |
| 205 | * @since 3.7.0 |
| 206 | * @since 5.5.0 The `$update` parameter accepts the value of null. |
| 207 | * |
| 208 | * @param bool|null $update Whether to update. The value of null is internally used |
| 209 | * to detect whether nothing has hooked into this filter. |
| 210 | * @param object $item The update offer. |
| 211 | */ |
| 212 | $update = apply_filters( "auto_update_{$type}", $update, $item ); |
| 213 | |
| 214 | if ( ! $update ) { |
| 215 | if ( 'core' === $type ) { |
| 216 | $this->send_core_update_notification_email( $item ); |
| 217 | } |
| 218 | return false; |
| 219 | } |
| 220 | |
| 221 | // If it's a core update, are we actually compatible with its requirements? |