Convert hex to string or string to hex

<?php
/**Converts hex into ascii string.
 */
function hex2str( $hex )
{
  echo htmlentities( $hex, ENT_NOQUOTES, 'UTF-8' );
}
// Example:
hex2str( "\x3c\x62\x3e\x48\x65\x6c\x6c\x6f\x2c\x20\x57\x6f\x72\x6c\x64\x21\x3c\x2f\x62\x3e" );

/**Converts a string into hex.
 */
function str2hex( $str )
{
  foreach( str_split( $str ) as $c )
    echo "\\x", dechex( ord( $c ));
}
// Example:
str2hex( '<b>Hello, World!</b>' );

?>
Bitcoin:	1QC38uPBSy7WSYz1whM5SYTHAdhqkN6o8V
Ethereum:	0x0855778a6181a69cc7d5d08c71c4f5846010eb67
Litecoin:	LbgSLsAbgbZBU2Ksg4vwuKHK8dAbJESi49
Verge:	D8fo1fszrNmUK4kfQW5owhYMv3osPvgn2g
Paste ID:	# jd2Nc
Date posted:	Tue, 10 Apr 2012 00:11:46 +0000
Date of expiration:	never (permanent entry)
Description:	Convert hex to string or string to hex