How important is thorough code review in identifying and resolving errors in PHP programming?

Thorough code review is crucial in identifying and resolving errors in PHP programming as it helps catch potential bugs, improve code quality, and ensure adherence to best practices. By reviewing each line of code, developers can spot mistakes, optimize performance, and enhance readability.

// Example of a simple PHP code snippet with an error that can be identified and resolved through thorough code review
function calculate_sum($num1, $num2) {
    $sum = $num1 + $num2;
    return $sum;
}

// Call the function with incorrect arguments
$result = calculate_sum("5", "3");

echo $result;