我发现如果我对某些浮点值使用round函数，可以舍入到两位小数，但有时，例如，$w = "World!";
$h = "Hello ".$w;
echo $h;
/*
* This will result printing out "Hello World";
* The reason for this is because $w is a "Container",
* that means the variable is keeping some information in it, basicly: it exists.
* Now you can also use this in functions:
*/
function some_function($full_string){
return $full_string;
}
echo some_function($h." What a good day!"); Which will result in "Hello World! What a good day!"
// I hope this was what you was looking for!
它将返回round(myvalu, 2)而不是1.2但实际上我希望每个返回的值都舍入到两位小数，即1.20而不是1.20。我该怎么办？
答案 0 :(得分：1)
这是显示数字时你要做的事情。
尝试
'%.2f' % num