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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 |
|---|---|
| 3584 | |
| 3585 | /** |
| 3586 | * Filters the canonical URL for a post. |
| 3587 | * |
| 3588 | * @since 4.6.0 |
| 3589 | * |
| 3590 | * @param string $string The post's canonical URL. |
| 3591 | * @param WP_Post $post Post object. |
| 3592 | */ |
| 3593 | return apply_filters( 'get_canonical_url', $canonical_url, $post ); |
| 3594 | } |
| 3595 | |
| 3596 | /** |
| 3597 | * Outputs rel=canonical for singular queries. |
| 3598 | * |
| 3599 | * @since 2.9.0 |
| 3600 | * @since 4.6.0 Adjusted to use wp_get_canonical_url(). |
| 3601 | */ |
| 3602 | function rel_canonical() { |