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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 |
|---|---|
| 3540 | |
| 3541 | /** |
| 3542 | * Filters the canonical URL for a post. |
| 3543 | * |
| 3544 | * @since 4.6.0 |
| 3545 | * |
| 3546 | * @param string $canonical_url The post's canonical URL. |
| 3547 | * @param WP_Post $post Post object. |
| 3548 | */ |
| 3549 | return apply_filters( 'get_canonical_url', $canonical_url, $post ); |
| 3550 | } |
| 3551 | |
| 3552 | /** |
| 3553 | * Outputs rel=canonical for singular queries. |
| 3554 | * |
| 3555 | * @since 2.9.0 |
| 3556 | * @since 4.6.0 Adjusted to use wp_get_canonical_url(). |
| 3557 | */ |
| 3558 | function rel_canonical() { |