json_decode and float values

Question

A friend asked me a simple code to grab values from a website, no problem. This website is using a json API, again, no problem.

But, after parsing results I figured values were all wrong.

Example:

A value on the json is 846.51, but my script is returning 844.71.

My current "code":

$data = file_get_contents('https://blockchain.info/fr/ticker');
$json = json_decode($data);

print_r($json->{'USD'}->{'15m'});

So, I searched and i found out it may be a php bug related to x64 processors, not sure.

Any workaround to fix this ?

Are you sure it's a bug of whatever sorts, and not just changing data or the wrong field being grabbed? — John Dvorak
– John Dvorak, Commented Nov 23, 2013 at 22:31
The "related" column contains good related questions. prevent php from parsing floats as floats in json_decode, PHP function json_decode decodes float value with zeros after point as int — Pekka
– Pekka, Commented Nov 23, 2013 at 22:32
Yeah i checked multiple time, numbers from json and from json_decode are not the same, can't get why. json: "USD" : {"15m" : 846.51, "last" : 846.51, "buy" : 842.03, "sell" : 846.51, "symbol" : "$"} php: { "USD" : {"15m" : 840.07, "last" : 840.07, "buy" : 840.04, "sell" : 840.07, "symbol" : "$"} — John Konolol
– John Konolol, Commented Nov 23, 2013 at 22:32

John Konolol · Accepted Answer · 2013-11-23 22:38:28Z

1

So ! It was indeed a php bug according to https://bugs.php.net/bug.php?id=50224

Here is the fixed version:

$data = file_get_contents('https://blockchain.info/fr/ticker');
$res = preg_replace( '/":(\d+)/', '":"\1"', $data );
$json = json_decode($res);

print_r($json->{'EUR'}->{'15m'});

answered Nov 23, 2013 at 22:38

John Konolol

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Comments

JayMore · Accepted Answer · 2016-09-22 21:23:18Z

0

Improving answer from John Konolol : the regex will not work if the value is a floatting decimal number expressed in sci format ("2.038069541E9").

Regex must be :

preg_replace( '/":(\d+\.*\d*E*e*\d*)/', '":"\1"', $data)

It will convert all number to string, including float number (1.34) or sci format numer (1E3) which are valid in Json.

answered Sep 22, 2016 at 21:23

JayMore

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