Function and usage of get_category() in wordpress

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    2024-01-06T16:26:55+00:00

    The get_category() function in WordPress is used to retrieve category data using either a category ID or a category object. Here's a detailed explanation of this function:

    Function:

    • Purpose: Retrieves category data given a category ID or category object.

    Description:

    • The function works with two types of inputs for the $category parameter:
      1. Object: If an object is passed, it's assumed to be a category row object retrieved from the database. The function will cache the category data for future use.
      2. Integer: If an integer is passed, it represents the category ID. The function will retrieve the category from the database if it's not already cached, and return it.
    • The category data, irrespective of the input type, undergoes several filters and is sanitized according to the $filter parameter.

    Parameters:

    1. $category (int | object, required): This is either the category ID or the category row object.
    2. $output (string, optional): Specifies the format of the returned data. Possible values are:
      • OBJECT: Returns a WP_Term object.
      • ARRAY_A: Returns an associative array.
      • ARRAY_N: Returns a numeric array.
      • Default is OBJECT.
    3. $filter (string, optional): Determines how the category fields are sanitized. The default value is 'raw'.

    Return:

    • The function returns category data in the format specified by the $output parameter. Possible return types are an object, an array, WP_Error, or null.
    • Returns WP_Error if $category is empty, or null if the category does not exist.

    Sample Usage:

    $category_id = 5; // Example category ID
    $category_data = get_category($category_id);
    
    if (is_wp_error($category_data)) {
        echo 'Error retrieving category.';
    } elseif ($category_data !== null) {
        echo 'Category Name: ' . $category_data->name;
    } else {
        echo 'Category does not exist.';
    }
    

    In this example, the get_category() function is used to retrieve data for a category with ID 5. The function checks if the returned data is an error or if the category exists, and then outputs the category name.

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