How to convert decimal to hexadecimal in PHP? (code example)

In PHP, you can convert decimal to hexadecimal by using the built-in function dechex() or base_convert() function. The following article will introduce to you how the dechex() and base_convert() functions convert decimal to hexadecimal. I hope it will be helpful to you. [Video tutorial recommendation: PHP tutorial]

Method 1: Use the dechex() function to convert decimal to hexadecimal

The dechex() function is a built-in function in PHP that is used to convert a given decimal number into its equivalent hexadecimal number. The word "dechex" in the function name stands for decimal to hexadecimal.

Note:

● The dechex() function only applies to unsigned numbers. If the argument passed to it is negative, then it will treat it as an unsigned number.

●The maximum number that can be converted is 4294967295 (decimal), and the result is "ffffffff".

Example:Convert decimal to hexadecimal

<?php
header("content-type:text/html;charset=utf-8");
$num1=10;
$num2=47;
$num3=4294967295;
echo "十进制 ".$num1." 转换成十六进制 ".dechex($num1)."<br>"; 
echo "十进制 ".$num2." 转换成十六进制 ".dechex($num2)."<br>"; 
echo "十进制 ".$num3." 转换成十六进制 ".dechex($num3)."<br>"; 
?>

Output:

Method 2: Use the base_convert() function to convert decimal to hexadecimal

The base_convert() function can convert numbers between any bases.

Example 1: Convert decimal to hexadecimal

<?php
header("content-type:text/html;charset=utf-8");
$num1=10;
$num2=47;
echo "十进制 ".$num1." 转换成十六进制 ".base_convert($num1,10,16)."<br>"; 
echo "十进制 ".$num2." 转换成十六进制 ".base_convert($num2,10,16)."<br>"; 
?>

Output:

十进制 10 转换成十六进制 a
十进制 47 转换成十六进制 2f

Example 2: Convert decimal Convert hexadecimal to decimal

<?php
header("content-type:text/html;charset=utf-8");
$hex="16e7";
$dec =base_convert($hex,16,10);
echo "十六进制 $hex 转换成十进制 $dec <br>"; 
?>

Output:

十六进制 16e7 转换成十进制 5863

Example 3:Convert octal to decimal

<?php
header("content-type:text/html;charset=utf-8");
$oct = "0031";
$dec = base_convert($oct,8,10);
echo "八进制 $oct 转换成十进制 $dec <br>"; 
?>

Output:

八进制 0031 转换成十进制 25

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