大家是如何避免金额转换的
大家是如何处理金额转换的？
比如表单提交过来的
最低竞价额，比如 51
每日消费最高限额，比如123456789.12
用floatval转换不会损失精度吗？
mysql数据库，存储类型为decimal(10, 2)
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用floatval转换不会损失精度吗？
会！
但是你为什么要转换成 float 呢？
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不会吧，你本来存进去就是浮点型的，取出来也一样，或者用sprintf("%01.2f", $money);
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money怎么验证?
可以有 +- 做前导
可以有 , 分节
可以有 . 小数点
除此以外都是数字
如果你还需要判断值设为范围，那请用 BC math 高精度数学函数
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涉及到钱的问题马虎不得，建议以分为单位，这样所有的计算都是整数计算，实际中不会存在精度的问题
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... ...
你能不能说清楚到底是什么目的？
防止注入？
验证金额数额是否准确？
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What is the maximum value of float?
Oct 11, 2023 pm 05:54 PM
Maximum value of float: 1. In C language, the maximum value of float is 3.40282347e+38. According to the IEEE 754 standard, the maximum exponent of the float type is 127, and the number of digits of the mantissa is 23. In this way, the maximum floating point number is 3.40282347 e+38; 2. In the Java language, the maximum float value is 3.4028235E+38; 3. In the Python language, the maximum float value is 1.7976931348623157e+308.
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The precision of float can reach 6 to 9 decimal places. According to the IEEE754 standard, the number of significant digits that the float type can represent is approximately 6 to 9 digits. It should be noted that this is only the theoretical maximum precision. In actual use, due to the rounding error of floating point numbers, the precision of the float type is often lower. When performing floating-point number operations in a computer, precision loss may occur due to the precision limitations of floating-point numbers. In order to improve the precision of floating point numbers, you can use higher precision data types, such as double or long double.
What does float mean in c language?
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Float in C language is a data type used to represent single-precision floating point numbers. Floating point numbers are real numbers represented in scientific notation and can represent very large or very small values. Variables of the float type can store values with 6 significant digits after the decimal point. In C language, the float type can be used to operate and store floating point numbers. Its variables can be used to represent decimals, fractions, scientific notation, etc. that need to be accurately represented. Real numbers, unlike integer types, floating point numbers can represent numbers after the decimal point, and can perform four arithmetic operations on decimals.
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What are the database float lengths?
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Common database float lengths are: 1. The float type length in MySQL can be 4 bytes or 8 bytes; 2. The float type length in Oracle can be 4 bytes or 8 bytes; 3. , The length of the float type in SQL Server is fixed at 8 bytes; 4. The length of the float type in PostgreSQL can be 4 bytes or 8 bytes, etc.
What does float32 bytes include?
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The float32 byte includes the sign bit, exponent bit and mantissa bit, and is used to represent 32-bit floating point numbers. Detailed introduction: 1. Sign bit (1 bit), used to represent the sign of a number, 0 represents a positive number, 1 represents a negative number; 2. Exponent bit (8 bits), used to represent the exponent part of a floating point number, through the exponent bit , you can adjust the size range of the floating-point number; 3. The mantissa bit (23 bits) is used to represent the mantissa part of the floating-point number, and the mantissa bit stores the decimal part of the floating-point number. The sign bit determines the sign of a floating point number, and the exponent bit and the mantissa bit jointly determine the size and precision of the floating point number.
What are the values of float attribute?
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The float attribute values include left, right, none, inherit, clearinline-start and inline-end. Detailed introduction: 1. left, the element floats to the left, that is, the element will be as close to the left side of the container as possible, and other elements will surround it on the right side; 2. right, the element floats to the right, that is, the element will be as close to the container as possible On the right, other elements will surround it on the left; 3. The default value of none, the elements will not float, and will be arranged according to the normal document flow, etc.
What problems will float layout cause?
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Float layout can cause problems such as clearing floats, element overlapping problems, text wrapping problems, and responsive layout problems. Detailed introduction: 1. Clear the floating problem. When using float layout, the floating elements will break away from the document flow, which may cause the parent container to be unable to wrap the floating elements correctly. In this case, the height of the parent container will collapse, causing layout chaos; 2. Element overlapping problem. When multiple elements use float layout, they may overlap. This is because the floating elements no longer occupy the normal document flow position and so on.
