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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 |
|---|---|
| 7171 | * Filters the admin referrer policy header value. |
| 7172 | * |
| 7173 | * @since 4.9.0 |
| 7174 | * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'. |
| 7175 | * |
| 7176 | * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referrer-Policy |
| 7177 | * |
| 7178 | * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'. |
| 7179 | */ |
| 7180 | $policy = apply_filters( 'admin_referrer_policy', $policy ); |
| 7181 | |
| 7182 | header( sprintf( 'Referrer-Policy: %s', $policy ) ); |
| 7183 | } |
| 7184 | |
| 7185 | /** |
| 7186 | * Retrieves a list of protocols to allow in HTML attributes. |
| 7187 | * |
| 7188 | * @since 3.3.0 |
| 7189 | * @since 4.3.0 Added 'webcal' to the protocols array. |