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run code in 150+ php & hhvm versions
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<?php function strToHex($string) { $hex=''; for ($i=0; $i < strlen($string); $i++) { $hex .= dechex(ord($string[$i])); } return $hex; } function hexToStr($hex) { $string=''; for ($i=0; $i < strlen($hex)-1; $i+=2) { $string .= chr(hexdec($hex[$i].$hex[$i+1])); } return $string; } $test = "ffff:eeee:dddd:cccc:bbbb:aaaa:9999:8888"; $testParts = explode(':', $test); $testHex = array(); foreach($testParts as $testPart){ array_push($testHex, $testPart); //echo strToHex($testPart) . "<br>\n"; } $packed = pack('HHHHHHHH', $testParts[0], $testParts[1], $testParts[2], $testParts[3], $testParts[4], $testParts[5], $testParts[6], $testParts[7]); $unpacked = unpack('HHHHHHHH', $packed); $unpackedString = array(); //var_dump($testParts); //var_dump($testHex); var_dump($packed); var_dump($unpacked); foreach($unpacked as $unpack){ array_push($unpackedString, $unpack); } echo implode(':', $unpackedString); ?>
Output for 4.4.2 - 4.4.9, 5.1.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(8) "�������" array(1) { ["HHHHHHH"]=> string(1) "f" } f
Output for 4.3.0 - 4.4.1, 5.0.0 - 5.1.1
string(8) "�������" array(1) { ["HHHHHHH"]=> string(0) "" }