Why is it important to thoroughly review and test all code, even if it has worked under different circumstances before, to avoid unexpected errors in PHP scripts?

Thoroughly reviewing and testing all code is important because even if a script has worked under different circumstances before, there may be hidden bugs or edge cases that could cause unexpected errors. By testing the code in various scenarios, developers can identify and fix any issues before they impact the functionality of the script. 

// Example PHP code snippet to demonstrate the importance of testing code thoroughly

// Function to add two numbers
function addNumbers($num1, $num2) {
    return $num1 + $num2;
}

// Testing the function with different scenarios
echo addNumbers(5, 10); // Output: 15
echo addNumbers(-5, 10); // Output: 5
echo addNumbers(0, 0); // Output: 0

Keywords

code review testing unexpected errors PHP scripts different circumstances

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