How can the error "Invalid shutdown callback" be resolved when using register_shutdown_function in PHP?

The error "Invalid shutdown callback" occurs when the function provided to register_shutdown_function is not a valid callback. To resolve this error, ensure that the function you are passing to register_shutdown_function is defined correctly and can be called as a callback. 

// Correct way to use register_shutdown_function with a valid callback function

function my_shutdown_function() {
    // Your shutdown code here
}

register_shutdown_function('my_shutdown_function');

Keywords

register_shutdown_function PHP error Invalid shutdown callback

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