Function and usage of is_wp_error() in wordpress


Answers ( 1 )


    The is_wp_error() function in WordPress is a utility function used to check whether a given variable is an instance of the WP_Error class. This function is particularly useful in WordPress development for error handling.

    Here's a detailed explanation:

    Function Signature:

    is_wp_error( mixed $thing ): bool

    Function Description:

    • Purpose: is_wp_error() is used to determine if a certain variable ($thing) contains an instance of the WP_Error class. This is important because WordPress often returns WP_Error objects in case of errors, and this function helps in identifying and handling those errors correctly in your code.
    • How It Works: The function checks whether the provided variable is an instance of the WP_Error class. It's a straightforward check that doesn't alter the state of the variable.


    • $thing (mixed): This is the variable that you want to check. It can be of any type (string, array, object, etc.). The function will determine if this variable is a WP_Error object.

    Return Value:

    • bool: The function returns true if $thing is an instance of WP_Error, and false otherwise.

    Sample Usage:

    Here's a simple example to illustrate how is_wp_error() might be used in a WordPress theme or plugin:

    // Assume $response is a variable that may hold a WP_Error object
    $response = some_function_that_might_fail();
    if ( is_wp_error( $response ) ) {
        // Handle the error
        error_log( $response->get_error_message() );
    } else {
        // Process the response
        // ...

    In this example:

    1. $response is a variable that receives a value from a function, which might fail and return a WP_Error object.
    2. is_wp_error( $response ) checks if $response is an instance of WP_Error.
    3. If it's an error, the code logs the error message.
    4. If it's not an error, the code proceeds to process the response.

    This function is crucial for robust error handling in WordPress development, ensuring that errors are caught and handled appropriately.

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