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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

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Line Code
2515       *
2516       * @since 2.7.0
2517       *
2518       * @param string      $url     The complete site URL including scheme and path.
2519       * @param string      $path    Path relative to the site URL. Blank string if no path is specified.
2520       * @param string|null $scheme  Scheme to give the site URL context. Accepts 'http', 'https', 'login',
2521       *                             'login_post', 'admin', 'relative' or null.
2522       * @param int|null    $blog_id Blog ID, or null for the current blog.
2523       */
2524      return apply_filters( 'site_url', $url, $path, $scheme, $blog_id );
2525 }
2527 /**
2528  * Retrieve the url to the admin area for the current site.
2529  *
2530  * @since 2.6.0
2531  *
2532  * @param string $path Optional path relative to the admin url.
2533  * @param string $scheme The scheme to use. Default is 'admin', which obeys force_ssl_admin() and is_ssl(). 'http' or 'https' can be passed to force those schemes.