Comparison of floating point data in PHP

Sometimes "<" or ">" is used directly in PHP to compare the size of two floating point data types.

 

 

Method 1:

 

PHP provides a native method to solve this problem.

 

The following is a brief introduction to this native function :)

 

Bccomp

 

Descriptionint Bccomp(String $ Left_operand, String $ Right_operand[, Int $ Scale])

ComparesLeft_operandToRight_operandAnd returns the result as an integer.

 

 

 

Parameters

 

Left_operand

The left operand, as a string.

Right_operand

The right operand, as a string.

Scale

The optionalScaleParameter is used to set the number of digits after the decimal place which will be used in the comparison.

Return values

Returns 0 if the two operands are equal, 1 ifLeft_operandIs larger thanRight_operand,-1 otherwise.

Example:

Echo bccomp ('1', '2 '). "/N"; //-1 <br/> echo bccomp ('1. 00001 ', '1', 3); // 0 <br/> echo bccomp ('1. 00001 ', '1', 5); // 1 <br/> 

Method 2:

 

Use the "-" operation directly. Compare the result of the difference between the two and 0.