Decimal, binary, octal and hexadecimal conversion functions in php_PHP tutorial

The article introduces in detail the application of decimal, binary, octal and hexadecimal conversion functions in PHP. Friends in need can refer to it.

1. Description of decimal system conversion function
1. Convert decimal to binary using the decbin() function, as shown in the following example

The code is as follows

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echo decbin(12); //Output 1100

代码如下	复制代码
echo decbin(12); //输出 1100 echo decbin(26); //输出 11010 decbin

echo decbin(26); //Output 11010

decbin

(PHP 3, PHP 4, PHP 5)
decbin -- Convert decimal to binary
Description string decbin (int number)

Returns a string containing the binary representation of the given number argument. The maximum value that can be converted is 4294967295 in decimal, which results in a string of 32 ones.

代码如下	复制代码
echo decoct(15); //输出 17 echo decoct(264); //输出 410 decoct

2, decimal to octal decoct() function

The code is as follows	Copy code
echo decoct(15); //Output 17 echo decoct(264); //Output 410 decoct

(PHP 3, PHP 4, PHP 5) decoct -- Convert decimal to octal

Description

string decoct (int number)

代码如下	复制代码
echo dechex(10); //输出 a echo dechex(47); //输出 2f dechex

Returns a string containing the octal representation of the given number argument. The maximum value that can be converted is 4294967295 in decimal, which results in "37777777777".

3, decimal to hexadecimal dechex() function

The code is as follows	Copy code
echo dechex(10); //Output a echo dechex(47); //Output 2f dechex

(PHP 3, PHP 4, PHP 5)
dechex -- Convert decimal to hexadecimal

Description

代码如下	复制代码
$binary = "11111001"; $hex = dechex(bindec($binary)); echo $hex;//输出f9 bin2hex

string dechex (int number)

Returns a string containing the hexadecimal representation of the given number argument. 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 to convert binary to hexadecimal

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$binary = "11111001"; $hex = dechex(bindec($binary)); echo $hex;//output f9 bin2hex

代码如下	复制代码
echo bindec('110011'); //输出 51 echo bindec('000110011'); //输出 51 echo bindec('111'); //输出 7 bindec

(PHP 3 >= 3.0.9, PHP 4, PHP 5) bin2hex -- Convert binary data to hexadecimal representation Description string bin2hex ( string str ) Returns an ASCII string that is the hexadecimal representation of argument str. Conversion uses byte mode, with the high nibble taking precedence. 2, binary to decimal conversion bindec() function

The code is as follows	Copy code
echo bindec('110011'); // Output 51 echo bindec('000110011'); //Output 51 echo bindec('111'); //Output 7 bindec

(PHP 3, PHP 4, PHP 5)
bindec -- Convert binary to decimal
Description
number bindec (string binary_string)
Returns the decimal equivalent of the binary number represented by the binary_string argument.
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.

Three, octal system conversion function description
Octal to decimal octdec() function

The code is as follows

代码如下	复制代码
echo octdec('77'); //输出 63 echo octdec(decoct(45)); //输出 45 octdec

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echo octdec('77'); // Output 63
echo octdec(decoct(45)); //Output 45
octdec

(PHP 3, PHP 4, PHP 5)

代码如下	复制代码
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

octdec -- Convert octal to decimal

Description
number octdec (string octal_string)
Returns the decimal equivalent of the octal number represented by the octal_string parameter. 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. Description of hexadecimal conversion function
Hexadecimal to decimal hexdec() function

The code is as follows

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代码如下	复制代码
$hexadecimal = 'A37334'; echo base_convert($hexadecimal, 16, 2);//输出 101000110111001100110100 base_convert

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 -- Convert hexadecimal to decimal

Description 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. Five, arbitrary base_convert() function

The code is as follows

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$hexadecimal = 'A37334'; echo base_convert($hexadecimal, 16, 2);//Output 101000110111001100110100 base_convert (PHP 3 >= 3.0.6, PHP 4, PHP 5) base_convert -- Convert numbers between arbitrary bases Description string base_convert (string number, int frombase, int tobase) Returns a string containing the representation of number 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. http://www.bkjia.com/PHPjc/632244.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632244.htmlTechArticleThe article introduces in detail the application of decimal, binary, octal and hexadecimal conversion functions in PHP. If necessary Friends can refer to it. 1. Decimal system...