hex2bin

(PHP >= 5.4.0)

hex2bin — Decodes a hexadecimally encoded binary string

说明

string hex2bin ( string $data )

Decodes a hexadecimally encoded binary string.

Caution

This function does NOT convert a hexadecimal number to a binary number. This can be done using the base_convert() function.

参数

data: Hexadecimal representation of data.

返回值

Returns the binary representation of the given data 或者在失败时返回 FALSE.

错误/异常

If the hexadecimal input string is of odd length an E_WARNING level error is thrown.

更新日志

版本	说明
PHP 5.4.1	A warning is thrown if the input string is of odd length. In PHP 5.4.0 the string was silently accepted, but the last byte was truncated.

范例

Example #1 hex2bin() example


<?php
$hex = hex2bin("6578616d706c65206865782064617461");
var_dump($hex);
?>

以上例程的输出类似于：

string(16) "example hex data"

参见

bin2hex() - 将二进制数据转换成十六进制表示
unpack() - Unpack data from binary string

add a note User Contributed Notes hex2bin

Anonymous 23-Feb-2012 02:28


The function pack("H*" , $hex_string); will not work as expected if $hex_string contains an odd number of hexadecimal digits.





For example:





<?php echo ord(pack("H*", 'F')); ?>





will return 240 not 15. Use pack("H*", '0F'); instead.

Anonymous 31-Aug-2011 01:32


The function hex2bin does not exist in PHP5.

You can use 'pack' instead :



$binary_string = pack("H*" , $hex_string);

add a note