How to convert scientific notation to full number string

Question

What php function should I use to do this type of conversion?

Convert: 1.3388383658903E+18 to: 1338838365890273563

I tried that, but it didn’t work:

echo sprintf(sprintf('%%.%df', 0), '1.3388383658903E+18');

And that too:

echo rtrim(sprintf('%.0F', $value), '0');

edited so far to better explain the problem:

Take this example with serialize:

$a = array('valor' => 1338838365890273563);
$serializado = serialize($a);

How to fix it when doing unserialize($serializado)?

Example in the ideone

Answer 1

On the numerical accuracy:

The question asks something that is not possible, convert 1.3388383658903E+18 for 1338838365890273563.

The notation 1.3388383658903E+18 is only accurate for the houses that are actually readable in the string.

If you need the original value, convert to string before of serialize:

$a = array('valor' => '1338838365890273563' );
$serializado = serialize($a);

See the quotes in the value. Note that even if your code is written the literal value:

$valor = 1338838365890273563;

internally PHP will only store what fits in the float. Thus, it is essential that you treat the data as string throughout the "life" of the script.

If you need more numerical capacity, you can use bc_math and GMP, but in your case probably strings are a better solution. More details in the PHP manual:

http://php.net/manual/en/language.types.integer.php

About the exhibition of scientific notation:

That’s all it takes:

echo sprintf( '%f', 1.3388383658903E+18 );

Or that, of course:

$numero = '1.3388383658903E+18'; // o ideal mesmo é sem aspas
echo sprintf( '%f', $numero );

If you prefer without the decimals:

echo sprintf( '%.0f', 1.3388383658903E+18 );

See working on IDEONE.

If it’s just for show on screen:

Then you don’t even need the echo, just use printf in place of sprintf:

printf( '%.0f', 1.3388383658903E+18 );

I kept the sprintf in the original example, because it is usually what will be used if you store the value in a string, or concatenate with something else.

Remarks:

• We can’t use %d, because the capacity of integers is burst;

• the use of .0 before the f serves to say that we want zero decimal places;

• there is no need to quote the value because the format nE+n is already understood as number by the language of course. But see in IDEONE that the problem is not this, because PHP does the cast anyway.

• makes no difference in our case, but beware, because %f and %F are different things. Both are float, but one of them is locale-aware (which changes the sign of decimals according to the region).

Answer 2

Just for the record here, there is a way to solve this serialize, which is by passing the number to string, that nobody thought:

$a = array('valor' => (string) 1338838365890273563);
$serializado = serialize($a);

echo $serializado;
echo "\n-------------------------\n";
var_dump(unserialize($serializado));

Andexample using function

Answer 3

$notation = 1.3388383658903E+18;


//Com decimais(8) só alterar conforme for necessario.

echo "Decimal: " . number_format($notation ,8);

//Sem decimais(bem simples apenas adicione 1 e depois adicione a quantidade de zeros que possui na versão decimal)

echo "Normal: " . number_format($notation * 100000000);

Answer 4

You add the scientific notation plus one (1) that it will return the number in double/float.

Ex.:

$notation = "1.3388383658903E+18";
echo $notation + 1;

This is because PHP is a weak typing language.