Function and usage of get_query_pagination_arrow() in wordpress

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    2024-01-07T18:38:17+00:00

    The get_query_pagination_arrow() function in WordPress is a helper function designed for use with the QueryPaginationNext and QueryPaginationPrevious blocks. This function plays a crucial role in managing pagination, particularly in custom block themes or when developing custom blocks that require pagination features.

    Function Signature

    get_query_pagination_arrow( WP_Block $block, bool $is_next ): string|null
    

    Description and Usage

    The primary purpose of this function is to return the appropriate pagination arrow HTML, which is necessary for navigating between different pages of a query (like posts or custom post types). It's specifically used within the QueryPaginationNext and QueryPaginationPrevious blocks to handle the rendering of the "next" and "previous" pagination arrows.

    Parameters

    1. $block (WP_Block): This is a required parameter. It represents the block instance for which the pagination arrow HTML is being generated. The function uses details from this block instance to determine the correct arrow HTML to output.

    2. $is_next (bool): This is also a required parameter. It's a boolean flag that determines the direction of the pagination. If set to true, the function generates the HTML for the "next" pagination arrow. If false, it generates the HTML for the "previous" pagination arrow.

    Return Value

    • string|null: The function returns a string containing the HTML markup for the pagination arrow. If there is no appropriate arrow to display (like if you're on the last page and there's no next page), the function returns null.

    Sample Usage

    Here's an example of how you might use get_query_pagination_arrow() in a block theme or plugin:

    // Assume $block is a WP_Block instance related to Query Pagination
    $next_arrow_html = get_query_pagination_arrow( $block, true );
    if ( $next_arrow_html ) {
        echo $next_arrow_html;
    } else {
        echo 'No next page available';
    }
    
    $prev_arrow_html = get_query_pagination_arrow( $block, false );
    if ( $prev_arrow_html ) {
        echo $prev_arrow_html;
    } else {
        echo 'No previous page available';
    }
    

    In this example, the function is called twice: once to get the HTML for the next page arrow and once for the previous page arrow. Each time, it checks if the returned value is not null (meaning there's an arrow to display) and then outputs the HTML. If null is returned, it outputs a message indicating that there's no next or previous page available.

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