Decimal, binary, octal, and hexadecimal conversions for PHP functions

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Chinese character coding Research series The first, the PHP function of the decimal, binary, octal and hexadecimal conversion function description, the main master of the various conversion methods to apply to the actual development

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

Echo Decbin (12); Output 1100 echo Decbin (26); Output 11010 Decbin (PHP 3, PHP 4, PHP 5) Decbin--Decimal conversion to 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

Echo decoct (15); Output of the Echo decoct (264); Output 410 Decoct (PHP 3, PHP 4, PHP 5) decoct--decimal converted 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

Echo Dechex (10); Output a echo dechex (47); Output 2f Dechex (PHP 3, PHP 4, PHP 5) Dechex--decimal conversion to hexadecimal

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".

two, binary (binary system) conversion function Description
1, binary turn 16 into Bin2Hex () function

$binary = "11111001"; $hex = Dechex (Bindec ($binary)); echo $hex;//Output F9 Bin2Hex (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

echo bindec (' 110011 '); Output the Echo bindec (' 000110011 '); Output the Echo bindec (' 111 '); Output 7 Bindec (PHP 3, PHP 4, PHP 5) Bindec--binary conversion to decimal notation 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

Echo Octdec (' 77 '); Output Octdec Echo (DECOCT (45)); Output Octdec (PHP 3, PHP 4, PHP 5) Octdec-Eight conversion 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

Var_dump (Hexdec ("See")); Var_dump (Hexdec ("ee")); Both print "int (238)" Var_dump (Hexdec ("that")); print "int" Var_dump (Hexdec ("A0")); print "int" Hexdec (PHP 3, PHP 4, PHP 5) Hexdec--16 binary converted 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

$hexadecimal = ' A37334 '; Echo Base_convert ($hexadecimal, 16, 2);//Output 101000110111001100110100 Base_convert (PHP 3 >= 3.0.6, PHP 4, PHP 5) Base_c Onvert--Converts a numeric description between arbitrary binaries 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.

This is mainly the PHP conversion function to organize, easy to develop the search, the relevant specific function description please refer to the PHP manual. Please pay attention to the next installment of the text character coding Study Series.