Function and usage of is_author() in wordpress

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    2024-01-08T20:52:28+00:00

    The is_author() function in WordPress is a conditional tag used to determine if a query is for an existing author archive page. This function is particularly useful in theme development for customizing content based on the author being queried.

    Function Signature

    is_author( int|string|int[]|string[] $author = '' ): bool
    

    Function Details

    • Purpose:

      • The primary function of is_author() is to check if the current query is for an author archive page.
      • Author archive pages are those that display a list of posts written by a specific author.
    • Description:

      • If the $author parameter is specified, is_author() goes a step further to check if the query is for one of the authors specified in the parameter.
      • This additional check allows for more granular control, enabling theme developers to customize the page for specific authors or groups of authors.
    • Parameters:

      • $author (int|string|int[]|string[]): Optional.
        • It can be a user ID, nickname, nicename, or an array of such values.
        • This parameter is used to specify the author(s) to check against in the query.
        • Default value is an empty string, meaning it checks for any author archive page without specificity.
    • Return:

      • Returns a boolean (bool).
      • true if the query is for an existing author archive page, and additionally matches the specified author(s) if any are provided.
      • false otherwise.

    Sample Usage

    1. Basic Check for Any Author Archive Page:

      if ( is_author() ) {
          // Do something specific for any author archive page.
      }
      
    2. Check for a Specific Author by User ID:

      if ( is_author( 123 ) ) { // Where 123 is the user ID.
          // Do something specific for the author with user ID 123.
      }
      
    3. Check for Multiple Authors by User ID or Nickname:

      $authors = array( 'john-doe', 456 ); // Array of nicknames and/or user IDs.
      if ( is_author( $authors ) ) {
          // Do something specific for the author pages of 'john-doe' or user ID 456.
      }
      

    Additional Information

    • It's recommended to read more about this and similar theme functions in the "Conditional Tags" article in the WordPress Theme Developer Handbook. This resource provides comprehensive guidance on using conditional tags for theme development, allowing for more dynamic and responsive theme behavior based on different queries and page types.

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