What is the error message "Fatal error: Call to undefined function zeitwandlung()" indicating in the PHP code provided?

The error message "Fatal error: Call to undefined function zeitwandlung()" indicates that the function zeitwandlung() is being called but has not been defined in the code. To solve this issue, you need to define the function zeitwandlung() before calling it in the code. 

// Define the function zeitwandlung()
function zeitwandlung() {
    // Function implementation goes here
}

// Call the function zeitwandlung()
zeitwandlung();

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Fatal error Call to undefined function zeitwandlung PHP code error message

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