How can syntax errors and code readability issues be addressed in PHP scripts to improve overall functionality and maintainability?

Syntax errors can be addressed by carefully reviewing the code for typos, missing brackets, or incorrect syntax. Code readability issues can be improved by following consistent naming conventions, adding comments to explain complex logic, and breaking down long functions into smaller, more manageable pieces. Example:

// Before fixing syntax errors and improving code readability
function myFunction($input){$output=[];for($i=0;$i<count($input);$i++){$output[$i]=strtoupper($input[$i]);}return $output;}

// After fixing syntax errors and improving code readability
function transformInputToUppercase(array $input): array {
    $output = [];
    for ($i = 0; $i < count($input); $i++) {
        $output[$i] = strtoupper($input[$i]);
    }
    return $output;
}