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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
3117       *
3118       * @since 3.0.0
3119       *
3120       * @param string      $url         The complete home URL including scheme and path.
3121       * @param string      $path        Path relative to the home URL. Blank string if no path is specified.
3122       * @param string|null $orig_scheme Scheme to give the home URL context. Accepts 'http', 'https',
3123       *                                 'relative', 'rest', or null.
3124       * @param int|null    $blog_id     Site ID, or null for the current site.
3125       */
3126      return apply_filters( 'home_url', $url, $path, $orig_scheme, $blog_id );
3127 }
3128
3129 /**
3130  * Retrieves the URL for the current site where WordPress application files
3131  * (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.
3132  *
3133  * Returns the 'site_url' option with the appropriate protocol, 'https' if
3134  * is_ssl() and 'http' otherwise. If $scheme is 'http' or 'https', is_ssl() is
3135  * overridden.