Convert float to string in php?

Question

Like:

float(1.2345678901235E+19) => string(20) \"12345678901234567890\"

Can it be done?

(it\'s for json_decode...)

Answer 1

I solved this issue by passing the argument JSON_BIGINT_AS_STRING for the options parameter.

json_decode($json, false, 512, JSON_BIGINT_AS_STRING)

See example #5 in the json_decode documentation

Answer 2

A double precision floating point number can only contain around 15 significant digits. The best you could do is pad the extra digits out with zeroes.

Answer 3

$float = 0.123;
$string = sprintf("%.3f", $float); // $string = "0.123";

Answer 4

It turns out json_decode by default casts large integers as floats. This option can be overwritten in the function call:

$json_array = json_decode($json_string, , , 1);

I'm basing this only on the main documentation, so please test and let me know if it works.

Answer 5

echo number_format($float,0,'.','');

note: this is for integers, increase 0 for extra fractional digits

Answer 6

The only way to decode a float without losing precision is to go through the json and frame all the floats in quotation marks. By making strings of numbers.

PHP json_decode integers and floats to string