How can developers ensure that they avoid errors related to undefined variables in PHP scripts, especially when making changes to variable names or structures?

To avoid errors related to undefined variables in PHP scripts, developers can use isset() or empty() functions to check if a variable is defined before using it. This can help prevent errors when making changes to variable names or structures by ensuring that the variable exists before attempting to access its value. 

if(isset($variable_name)){
   // variable is defined, proceed with using it
   echo $variable_name;
} else {
   // handle the case where the variable is not defined
   echo "Variable is not defined";
}

Keywords

PHP error handling debugging isset function variable scope

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