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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 |
|---|---|
| 181 | * Filter the escaped Global Unique Identifier (guid) of the post. |
| 182 | * |
| 183 | * @since 4.2.0 |
| 184 | * |
| 185 | * @see get_the_guid() |
| 186 | * |
| 187 | * @param string $guid Escaped Global Unique Identifier (guid) of the post. |
| 188 | * @param int $id The post ID. |
| 189 | */ |
| 190 | echo apply_filters( 'the_guid', $guid, $id ); |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Retrieve the Post Global Unique Identifier (guid). |
| 195 | * |
| 196 | * The guid will appear to be a link, but should not be used as an link to the |
| 197 | * post. The reason you should not use it as a link, is because of moving the |
| 198 | * blog across domains. |
| 199 | * |