How can undefined function errors, such as "Call to undefined function: de()", be resolved in PHP code?

Undefined function errors in PHP, such as "Call to undefined function: de()", occur when a function is called that has not been defined or included in the code. To resolve this issue, make sure that the function is defined or included in the code before calling it. This can be done by including the file where the function is defined or by defining the function within the same file. 

// Define the function de() before calling it
function de($value) {
    // Function logic here
}

// Call the function de()
de($some_value);

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undefined function error PHP resolve de

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