How to convert Decimal type to integer type in PHP

In PHP, we often need to convert a Decimal type to an integer type, but this is not as simple as we think. Because the Decimal type is just like a floating point type, there will be an issue of inaccurate decimal place selection. This article will introduce how to convert Decimal type to integer type in PHP.

1. The difference between Decimal type and integer type

First of all, we need to understand the difference between Decimal type and integer type. In PHP, the Decimal type is represented in the form of a string, as follows:

$decimal = "3.1415926";

And the integer type is represented in the form of a number:

$integer = 31415926;

The main problem with the Decimal type is , the accuracy of floating point numbers is inconsistent when stored in the computer, and there may be some errors in decimal places. This often causes some trouble in our calculations.

2. Convert Decimal type to integer type

When we need to convert Decimal type to integer type, we can use some functions provided by PHP. First, we can use the round() function to get the nearest integer value. As shown below:

$decimal = "3.1415926";
$integer = round($decimal);

In this way, the $decimal variable can be converted to 3.

However, there is a more accurate and safe method, which is to use bc math extension. This extension provides precise mathematical functions for calculations and conversions of Decimal types. In this case, we can use the function bcdiv() to perform the conversion. As shown below:

$decimal = "3.1415926";
$integer = bcdiv($decimal, "1", 0);

In this example, the second parameter of the bcdiv() function is 1. This number is used to represent the number of pointer digits. In this example, we need to convert $decimal to a number such as "3.00", so the exponent should be 2. The last parameter is 0, which means we need to discard the decimal places and only keep the integer part.

3. Summary

In PHP, converting Decimal type to integer type is not as simple as we think. Since the Decimal type has floating point errors, we need to take appropriate methods to ensure accuracy and safety. The most common method is to use the round() function and the bcdiv() function in the bc math extension to achieve conversion. We should choose the appropriate method according to the specific situation.

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