How can PHP developers ensure accurate representation and manipulation of very large numbers in their code?

PHP developers can ensure accurate representation and manipulation of very large numbers in their code by using the BCMath extension, which provides arbitrary precision mathematics functions. By using functions like `bcadd`, `bcsub`, `bcmul`, and `bcdiv`, developers can perform calculations on numbers with arbitrary precision. This ensures that even very large numbers can be accurately represented and manipulated in PHP.

// Using the BCMath extension for arbitrary precision mathematics
$largeNumber1 = '123456789012345678901234567890';
$largeNumber2 = '987654321098765432109876543210';

$sum = bcadd($largeNumber1, $largeNumber2);
$diff = bcsub($largeNumber1, $largeNumber2);
$product = bcmul($largeNumber1, $largeNumber2);
$quotient = bcdiv($largeNumber1, $largeNumber2);

echo "Sum: $sum\n";
echo "Difference: $diff\n";
echo "Product: $product\n";
echo "Quotient: $quotient\n";