在PHP中将大数字转换为可用字符串

Question

I am getting data from an API and it includes a long number, for example: 7979798798798798798798797987 . I need to put this number into a URL so the variable doesn't need to be a number but I do need it to stay intact precisely. At the moment PHP is automatically converting the large number into scientific notation. I have tried all these things like sprintf and trying to cast it as a string but it's not working for me.

Here's a demo:

$myvar = 7979798798798798798798797987; //can't change this as this is from api

echo $myvar; // needs to print out 7979798798798798798798797987

Answer 1

If PHP encounters a number beyond the bounds of the integer type, it will be interpreted as a float instead (which is what you have) of int but float have a limited precision of around 14 digits.

If the number is less than 14 digits, you can use sprintf('%0.0f',$number) ;

In your case, you would need to work from your source data (json), as there is no way you can produce an exact representation of that number from its current form (float).

you can use the JSON_BIGINT_AS_STRING options in json_decode

Sample Test Code

<?php
$json = '{"number":7979798798798798798798797987, "data":"some other data"}';
$output=json_decode($json, false, 512, JSON_BIGINT_AS_STRING);
echo $output->number; \\output 7979798798798798798798797987
?>