php 在php中将浮点数转换为字符串?
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Convert float to string in php?
提问by tweety
Like:
喜欢:
float(1.2345678901235E+19) => string(20) "12345678901234567890"
浮动(1.2345678901235E+19)=>字符串(20)“12345678901234567890”
Can it be done?
可以做到吗?
(it's for json_decode...)
(它用于 json_decode ...)
回答by Karoly Horvath
echo number_format($float,0,'.','');
note: this is for integers, increase 0 for extra fractional digits
注意:这是整数,额外的小数数字增加 0
回答by lubart
$float = 0.123;
$string = sprintf("%.3f", $float); // $string = "0.123";
回答by Anthony
It turns out json_decode
by default casts large integers as floats. This option can be overwritten in the function call:
事实证明json_decode
,默认情况下将大整数转换为浮点数。这个选项可以在函数调用中被覆盖:
$json_array = json_decode($json_string, , , 1);
I'm basing this only on the main documentation, so please test and let me know if it works.
我只基于主要文档,所以请测试并让我知道它是否有效。
回答by Alnitak
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.
双精度浮点数只能包含大约 15 个有效数字。你能做的最好的事情就是用零填充额外的数字。
回答by Astrotim
I solved this issue by passing the argument JSON_BIGINT_AS_STRING
for the options
parameter.
我通过传递参数JSON_BIGINT_AS_STRING
的options
参数解决了这个问题。
json_decode($json, false, 512, JSON_BIGINT_AS_STRING)
json_decode($json, false, 512, JSON_BIGINT_AS_STRING)
See example #5 in the json_decode documentation
请参阅json_decode 文档中的示例 #5