How can the use of logical operators in PHP, such as && versus &, impact the accuracy of calculations in a program?

Using logical operators like && (logical AND) and & (bitwise AND) in PHP can impact the accuracy of calculations in a program. The logical operator && is used for logical comparisons and short-circuiting, while the bitwise operator & is used for binary operations. Using the wrong operator can lead to unexpected results in calculations. To ensure accuracy, always use the correct logical operator for comparisons and avoid mixing up logical and bitwise operators.

// Incorrect usage of bitwise operator &
$num1 = 5;
$num2 = 3;

if ($num1 & $num2) {
    echo "Numbers are not equal";
} else {
    echo "Numbers are equal";
}

// Correct usage of logical operator &&
$num1 = 5;
$num2 = 3;

if ($num1 && $num2) {
    echo "Both numbers are non-zero";
} else {
    echo "At least one number is zero";
}