问题与浮游物！ （在PHP中） [英] Problem with Floats! (in PHP)

问题描述

  $ v = 5.2 * 3; 
 
 if（$ v == 15.6）{
 echo'Everything is fine =）'; 
} else {
 echo'好吧，有什么地方是错的：S'; 
 var_dump（$ v）; 
 
 
 
 
 
 
 
 
  $ v = 5.2 * 3; 
 
 if（$ v> 15.6 AND $ v <15.60000000001）{
 echo'我们注定：S'; 
 var_dump（$ v）; // float 15.6 
} else {
 echo'Everything is fine =）'; 
} 
  
我想这与内部表示或一些模糊的低级别有关东东？如果是这样的话，我该如何解决这个问题？ 
在使用这个来计算真实货币交易之前还有什么我应该知道的？
 
解决方案
我确定这是一个重复，所以我做这个CW 
  $ v = 5.2 * 3; 
 if（bccomp（$ v，15.6）=== 0）{
 echo'Everything is fine =）'; 
} else {
 echo'好吧，有什么地方是错的：S'; 
 var_dump（$ v）; // float 15.6 
 
 code $ 
 
 
 
将给出'Everything is fine =''
 
What's wrong with php floats?
$v = 5.2 * 3;

if($v==15.6) {
    echo 'Everything is fine =)';
} else {
    echo 'Okay something is wrong :S';
    var_dump($v); // float 15.6
}
Check this out too:
$v = 5.2 * 3;

if($v>15.6 AND $v<15.60000000001) {
    echo 'We are doomed :S';
    var_dump($v); // float 15.6
} else {
    echo 'Everything is fine =)';
}
I guess it has something to do with the internal representation or some obscure low level stuff? If that's the case, how do I get around this issue?
Anything else I should know before using this to calculate real money transactions?
解决方案
I am sure this is a duplicate, so I'm making this a CW
$v = 5.2 * 3;
if (bccomp($v, 15.6) === 0) {
    echo 'Everything is fine =)';
} else {
    echo 'Okay something is wrong :S';
    var_dump($v); // float 15.6
}
will give 'Everything is fine =)'

                        
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