# PHP decimal, binary, octal, and 16 binary conversion Functions _php tutorial

Source: Internet
Author: User
This article introduces in detail the application of decimal, binary, octal and 16 binary conversion functions in PHP, and the friends who need it can refer to the following.

One, decimal system conversion function description
1, decimal to Binary decbin () function, the following example

 The code is as follows Copy Code Echo Decbin (12); Output 1100Echo Decbin (26); Output 11010Decbin

(PHP 3, PHP 4, PHP 5)
Decbin--decimal conversion into binary
Description
string Decbin (int number)
Returns a string that contains a binary representation of the given number parameter. The maximum value that can be converted is a decimal of 4294967295, and the result is a string of 32 1.

2, decimal turn octal decoct () function

 The code is as follows Copy Code Echo decoct (15); Output 17Echo decoct (264); Output 410Decoct

(PHP 3, PHP 4, PHP 5)
DECOCT--Decimal conversion to octal
Description
string decoct (int number)
Returns a string that contains the octal representation of the given number parameter. The maximum value that can be converted is a decimal of 4294967295, and the result is "37777777777".

3, decimal to hexadecimal dechex () function

 The code is as follows Copy Code Echo Dechex (10); Output AEcho Dechex (47); Output 2fDechex

(PHP 3, PHP 4, PHP 5)
Description
string Dechex (int number)
Returns a string that contains the hexadecimal representation of the given number parameter. The maximum value that can be converted is 4294967295 in decimal and the result is "FFFFFFFF".

Binary (binary system) conversion function description
1, binary turn 16 into Bin2Hex () function

 The code is as follows Copy Code \$binary = "11111001";\$hex = Dechex (Bindec (\$binary));echo \$hex;//Output F9Bin2Hex

(PHP 3 >= 3.0.9, PHP 4, PHP 5)
Bin2Hex--converts binary data to hexadecimal notation
Description
String Bin2Hex (String str)
Returns an ASCII string that is the hexadecimal representation of the parameter str. The conversion uses byte mode, and the high four-bit byte takes precedence.

2, binary turn 10 into Bindec () function

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

(PHP 3, PHP 4, PHP 5)
Bindec--Binary conversion to decimal
Description
Number Bindec (String binary_string)
Returns the decimal value of the binary number represented by the binary_string parameter.
Bindec () converts a binary number to an integer. The maximum number of convertible is 31 bits 1 or decimal 2147483647. Starting with PHP 4.1.0, the function can handle large values, in which case it returns a float type.

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

 The code is as follows Copy Code Echo Octdec (' 77 '); Output 63Echo Octdec (DECOCT (45)); Output 45Octdec

(PHP 3, PHP 4, PHP 5)
Octdec--Eight binary to decimal
Description
Number Octdec (String octal_string)
Returns the decimal equivalent of the octal number represented by the octal_string parameter. The maximum number of convertible values is 17777777777 or decimal 2147483647. PHP 4.1.0 begins, the function can handle large numbers, in which case it returns a float type.

Four, Hex (hexadecimal) Conversion function description
hexadecimal to decimal hexdec () function

 The code is as follows Copy Code 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--16 binary to Decimal
Description
Number Hexdec (String hex_string)
Returns the decimal number equivalent to 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 7FFFFFFF, which is 2147483647 of the decimal. PHP 4.1.0 begins, the 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 the left 0 are ignored, but the 0 on the right is counted into the value.

Five, Arbitrary binary conversion Base_convert () function

 The code is as follows Copy Code \$hexadecimal = ' A37334 ';Echo Base_convert (\$hexadecimal, 16, 2);//Output 101000110111001100110100Base_convert

(PHP 3 >= 3.0.6, PHP 4, PHP 5)

Base_convert-Converts a number between arbitrary binaries
Description
String Base_convert (string number, int frombase, int tobase)
Returns a string that contains the representation of number in the Tobase binary. The binary of number itself is specified by Frombase. Both Frombase and tobase can only be between 2 and 36 (including 2 and 36). Numbers above the decimal are expressed in letters A-Z, for example a means that 10,b represents 11 and Z represents 35.

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