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HomeBackend DevelopmentPHP TutorialPHP怎么将16进制转换成10进制?

PHP怎么将16进制转换成10进制?

Jun 13, 2016 am 11:58 AM
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PHP怎么将16进制转换成10进制?

十六进制转十进制:

16进制数的第0位的权值为16的0次方,第1位的权值为16的1次方,第2位的权值为16的2次方……

所以,在第N(N从0开始)位上,如果是是数 X (X 大于等于0,并且X小于等于 15,即:F)表示的大小为 X * 16的N次方。

例:2AF5换算成10进制:

用竖式计算:

第0位: 5 * 16^0 = 5

第1位: F * 16^1 = 240

第2位: A * 16^2= 2560

第3位: 2 * 16^3 = 8192

直接计算就是:

5 * 16^0 + F * 16^1 + A * 16^2 + 2 * 16^3 = 10997

那么怎么用PHP将16进制转换成10进制?

在PHP中想要将16进制转换成10进制,可以使用hexdec()函数来实现。

hexdec() 函数把十六进制数转换为十进制数。

语法

hexdec(hex_string);

参数:

hex_string:必需。规定要转换的十六进制字符串。    

返回值:

返回与hex_string参数所表示的十六进制数等值的的十进制数。

说明:

  • hexdec() 将一个十六进制字符串转换为十进制数。所能转换的最大数值为 7fffffff,即十进制的 2147483647。PHP 4.1.0 开始,该函数可以处理大数字,这种情况下,它会返回 float 类型。

  • hexdec() 将遇到的所有非十六进制字符替换成 0。这样,所有左边的零都被忽略,但右边的零会计入值中。

示例:

<?php
echo hexdec("5e") . "<br>"; 
echo hexdec("a") . "<br>"; 
echo hexdec("f1f1") . "<br>"; 
echo hexdec("abc451") . "<br>"; 
?>

输出:

94
10
61937
11256913

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