Detailed explanation of how to convert decimal to binary in php

PHP is a programming language that many people are very familiar with. It can be used to perform a variety of programming operations. Among them, conversion between decimal and binary is a very common conversion operation in programming. This article will introduce how to use PHP to convert decimal numbers to binary numbers.

1. Basic concepts of decimal numbers

First of all, we need to understand the basic concepts of decimal numbers. Decimal numbers are the most common way to represent numbers in our daily lives. They have 10 different numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. In decimal numbers, the weight of each digit is a power of 10. For example, the weight of the first digit is 10 raised to the power 0, the weight of the second digit is 10 raised to the power 1, and so on.

2. Basic concepts of binary numbers

Next, we need to understand the basic concepts of binary numbers. Binary numbers contain only two different numbers: 0 and 1, and are the most basic way of representing numbers in computers. In binary numbers, the weight of each digit is a power of 2. For example, the weight of the first digit is 2 raised to the power 0, the weight of the second digit is 2 raised to the power 1, and so on.

3. How to convert decimal numbers to binary numbers

Now, let’s introduce how to use PHP to convert decimal numbers to binary numbers. PHP provides a built-in function decbin() that can convert decimal numbers into binary numbers. Here is a simple code example:

<?php
$num = 10; // 十进制数字
$bin = decbin($num); // 转换为二进制数字
echo $bin; // 输出二进制数字
?>

In the above code, we first define a variable $num to represent the decimal number to be converted, and then use the decbin() function to convert it to a binary number, and Save the result to the variable $bin, and finally use echo to output the value of the $bin variable.

4. Manual method of converting decimal numbers to binary numbers

In addition to using the decbin() function, we can also manually convert decimal numbers to binary numbers. The following is a common manual method:

(1) Keep dividing the decimal number by 2, and use the remainder as the last digit of the binary number until the quotient is 0.

(2) Arrange the remainders in reverse order, and the result obtained is the corresponding binary number.

The following is a simple code example:

<?php
$num = 10; // 十进制数字
$bin = &#39;&#39;; // 二进制数字
while ($num > 0) {
    $mod = $num % 2; // 求余数
    $bin = $mod . $bin; // 将余数拼接到二进制数字的最前面
    $num = ($num - $mod) / 2; // 求商
}
echo $bin; // 输出二进制数字
?>

In the above code, we use a while loop to continuously find the quotient and remainder, and splice the remainder to the front of the binary number , the final result is the corresponding binary number.

5. Summary

This article introduces how to use PHP to convert decimal numbers to binary numbers, mainly including the built-in function decbin() and manual conversion methods. Through the introduction of this article, I believe that you have mastered how to convert between decimal and binary, and I hope it will be helpful to you.

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