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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 |
|---|---|
| 3935 | |
| 3936 | /** |
| 3937 | * Filters the canonical URL for a post. |
| 3938 | * |
| 3939 | * @since 4.6.0 |
| 3940 | * |
| 3941 | * @param string $canonical_url The post's canonical URL. |
| 3942 | * @param WP_Post $post Post object. |
| 3943 | */ |
| 3944 | return apply_filters( 'get_canonical_url', $canonical_url, $post ); |
| 3945 | } |
| 3946 | |
| 3947 | /** |
| 3948 | * Outputs rel=canonical for singular queries. |
| 3949 | * |
| 3950 | * @since 2.9.0 |
| 3951 | * @since 4.6.0 Adjusted to use `wp_get_canonical_url()`. |
| 3952 | */ |
| 3953 | function rel_canonical() { |