How to do hex2bin in php5.3

Question

hex2bin() function is supported after php5.4. It is not available in php5.3. How can I do hex2bin in php3 ?

 echo hex2bin("48656c6c6f20576f726c6421");

Answer 1

In PHP 5.3 you can use pack

docs

Pack given arguments into a binary string according to format.

string pack ( string $format [, mixed $args [, mixed $... ]] )

So you're looking for:

$result = pack('H*', '48656c6c6f20576f726c6421');

Answer 2

Just use

 $foo = pack("H*" ,"48656c6c6f20576f726c6421");
 echo $foo