What potential issues or errors could arise from the PHP code if not properly formatted or executed?

Potential issues that could arise from improperly formatted or executed PHP code include syntax errors, undefined variables, and unexpected behavior. To solve these issues, it is important to carefully check the code for syntax errors, properly declare and initialize variables, and ensure that functions and control structures are used correctly.

// Example of fixing syntax errors
if ($condition) {
    echo "Condition is true";
} else {
    echo "Condition is false";
}