PHP function decimal, binary, octal and hexadecimal conversion

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Chinese Character Encoding The first issue of the research series, the PHP function chapter explains in detail the conversion functions between decimal, binary, octal and hexadecimal, mainly mastering the methods of conversion of each base, so as to apply it to actual development

1, Decimal system (decimal system) conversion function description
1, decimal to binary decbin() function, the following example

echo decbin(12); //输出 1100 
echo decbin(26); //输出 11010 
decbin 
(PHP 3, PHP 4, PHP 5) 
decbin -- 十进制转换为二进制

Description
string decbin (int number)
Returns a string containing the binary representation of the given number parameter. The maximum value that can be converted is 4294967295 in decimal, which results in a string of 32 ones.

2, decimal to octal decoct() function

echo decoct(15); //输出 17 
echo decoct(264); //输出 410 
decoct 
(PHP 3, PHP 4, PHP 5) 
decoct -- 十进制转换为八进制

Description
string decoct (int number)
Returns a string containing the given The octal representation of the number parameter. The maximum value that can be converted is 4294967295 in decimal, which results in "37777777777".

3, convert decimal to hexadecimal dechex() function

echo dechex(10); //输出 a 
echo dechex(47); //输出 2f 
dechex 
(PHP 3, PHP 4, PHP 5) 
dechex -- 十进制转换为十六进制

Description
string dechex (int number)
Returns a string containing Has the hexadecimal representation of the given number parameter. The maximum value that can be converted is 4294967295 in decimal, which results in "ffffffff".

2. Description of binary system conversion function
1. Bin2hex() function from binary to hexadecimal system

$binary = "11111001"; 
$hex = dechex(bindec($binary)); 
echo $hex;//输出f9 
bin2hex 
(PHP 3 >= 3.0.9, PHP 4, PHP 5) 
bin2hex -- 将二进制数据转换成十六进制表示

Description
string bin2hex (string str)
Returns the ASCII string, which is the hexadecimal representation of the parameter str. Conversion uses byte mode, with the high nibble taking precedence.

2, Binary to decimal conversion bindec() function

echo bindec('110011'); //输出 51 
echo bindec('000110011'); //输出 51 
echo bindec('111'); //输出 7 
bindec 
(PHP 3, PHP 4, PHP 5) 
bindec -- 二进制转换为十进制 
说明 
number bindec ( string binary_string )

Returns the decimal equivalent of the binary number represented by the binary_string parameter.
bindec() Converts a binary number to an integer. The largest number that can be converted is 31 digits, or 2147483647 in decimal. Starting with PHP 4.1.0, this function can handle large values, in which case it returns a float type.

3. Description of octal system conversion function
Octal to decimal octdec() function

echo octdec('77'); //输出 63 
echo octdec(decoct(45)); //输出 45 
octdec 
(PHP 3, PHP 4, PHP 5) 
octdec -- 八进制转换为十进制 
说明 
number octdec ( string octal_string )

Returns what the octal_string parameter represents The decimal equivalent of an octal number. The largest value that can be converted is 17777777777 or 2147483647 in decimal. Starting with PHP 4.1.0, this function can handle large numbers, in which case it returns a float type.

4. Hexadecimal (hexadecimal) conversion function description
Hexadecimal to decimal hexdec() function

var_dump(hexdec("See")); 
var_dump(hexdec("ee")); 
// both print "int(238)" 
var_dump(hexdec("that")); // print "int(10)" 
var_dump(hexdec("a0")); // print "int(160)" 
hexdec 
(PHP 3, PHP 4, PHP 5) 
hexdec -- 十六进制转换为十进制 
说明 
number hexdec ( string hex_string )

Returns the decimal equivalent of the hexadecimal number represented by the hex_string parameter. hexdec() Converts a hexadecimal string to a decimal number. The maximum value that can be converted is 7ffffffff, which is 2147483647 in decimal. Starting with PHP 4.1.0, this function can handle large numbers, in which case it returns a float type.
hexdec() Replaces all non-hexadecimal characters encountered with 0. This way, all zeros on the left are ignored, but zeros on the right are included in the value.

5. Arbitrary base_convert() function

$hexadecimal = 'A37334'; 
echo base_convert($hexadecimal, 16, 2);//输出 101000110111001100110100 
base_convert 
(PHP 3 >= 3.0.6, PHP 4, PHP 5) 
base_convert -- 在任意进制之间转换数字 
说明 
string base_convert ( string number, int frombase, int tobase )

Returns a string containing number expressed in tobase base. The base of number itself is specified by frombase. Both frombase and tobase can only be between 2 and 36 (inclusive). Numbers above decimal are represented by the letters a-z, such as a for 10, b for 11, and z for 35.

Here we mainly organize the PHP hexadecimal conversion functions to facilitate development and search. Please refer to the PHP manual for relevant specific function descriptions. Please pay attention to the next issue of the Chinese character encoding research series.

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