blocks|key|608767|text|双精度浮点数只能包含大约15位有效数字。你能做的最好的事情就是用零来填充多余的数字。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|608768|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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.

blocks|key|608839|text|echo+number_format($float,0,'.','');|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|608840|注意:这是整数，如果是额外的小数位数，则增加0|unstyled|608841|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>echo number_format($float,0,'.','');
</code></pre>

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

blocks|key|823907|text|事实证明，默认情况下，json_decode将大整数转换为浮点数。可以在函数调用中覆盖此选项：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|823908|$json_array+=+json_decode($json_string,+,+,+1);|code-block|syntax|javascript|823909|我只是基于主要的文档，所以请测试并让我知道它是否工作。|823910|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/function.json-decode.php^0|B|B|B|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

It turns out <a href="http://www.php.net/manual/en/function.json-decode.php" rel="nofollow"><code>json_decode</code></a> by default casts large integers as floats. This option can be overwritten in the function call:

<pre><code>$json_array = json_decode($json_string, , , 1);
</code></pre>

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

blocks|key|823928|text|$float+=+0.123;
$string+=+sprintf("%25.3f",+$float);+//+$string+=+"0.123";|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|823929|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

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

blocks|key|608999|text|我通过为options参数传递实参JSON_BIGINT_AS_STRING解决了这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|609000|json_decode($json,+false,+512,+JSON_BIGINT_AS_STRING)|609001|请参阅json_decode+documentation中的示例#5|609002|entityMap|0|LINK|mutability|MUTABLE|url|http://www.php.net/manual/en/function.json-decode.php^0|4|7|H|L|0|0|1H|0|3|P|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@$9|10|A|11|1|12]]|E|$]]|$1|J|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

I solved this issue by passing the argument <code>JSON_BIGINT_AS_STRING</code> for the <code>options</code> parameter.

<code>json_decode($json, false, 512, JSON_BIGINT_AS_STRING)</code>

See example #5 in the <a href="http://www.php.net/manual/en/function.json-decode.php" rel="nofollow">json_decode documentation</a>

blocks|key|609042|text|在不损失精度的情况下解码浮点数的唯一方法是遍历json并将所有浮点数用引号括起来。通过把数字串起来。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|609043|PHP+json_decode+integers+and+floats+to+string|offset|length|609044|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/30108803/php-json-decode-integers-and-floats-to-string/65057385#65057385^0|0|0|19|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

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.
<a href="https://stackoverflow.com/questions/30108803/php-json-decode-integers-and-floats-to-string/65057385#65057385">PHP json_decode integers and floats to string</a>

Like:

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

Can it be done?

(it's for json_decode...)

Convert float to string in php?

像这样：float(1.2345678901235E+19) => string(20) "12345678901234567890“这是可以做到的吗？(这是给json_decode的……)

问在php中将浮点数转换为字符串？
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