PHP: How to convert bigint from int to string?

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You actually should ensure that you type what you mean:

$bigint = 9999999999999999999;

Is not a PHP integer but float:

float(1.0E+19)

If you would have done 

$bigint = (int) 9999999999999999999;

You would have set an integer in fact, but it would not be the number you might have expected:

int(-8446744073709551616)

It’s no problem at all to turn that into string as you might have guessed. So take care when you write numbers into code that you actually write what you mean.

See this line again:

$bigint = 9999999999999999999;

try to understand what you have actually written. It’s not an integer at all because PHP will turn it into a float. See Example #4 Integer overflow on a 64-bit system in the integer manual page.

If you need higher precision, checkout GNU Multiple Precision, it might have what you’re looking for. However, this won’t change how to write numbers in PHP:

$bigint = gmp_init("9999999999999999999");
$bigint_string = gmp_strval($bigint);
var_dump($bigint, $bigint_string);

Output:

resource(4) of type (GMP integer)
string(19) "9999999999999999999"

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