md5 16-bit binary and 32-bit string conversion.

Passwords are often saved in md5, and are often in 16-bit binary format md5. md5($str,true) in php can be easily obtained. More often than not, the md5 result is a set of 32 characters. String. I encountered this problem and searched it with a search engine. The search results were various. In fact, the conversion is very simple. I hope it will be helpful to everyone. If it is useful, remember to bookmark it

Passwords are often saved using md5, and are often in 16-bit binary format md5, which can be easily obtained using md5($str, true) in
php. More often than not, the md5 result is a set of 32 characters. String.
I encountered this problem and searched it with a search engine. The search results were varied. In fact, the conversion is very simple. I hope it will be helpful to everyone. If it is useful, remember to bookmark it. d648d7d84be222d28bc97c69767ed12f

<?php

$str = 'test';
$cm = md5($str);
$bm = md5($str, true);

$cstr = implode(unpack('H*', $bm));
$bstr = pack('H*', $cm);


echo 'str:'. $str . "<br >\n";
echo 'cm :' . $cm . "<br >\n";
echo 'cstr:' . $cstr . "<br >\n";
echo 'urlencode(bm)  :' . urlencode($bm) . "<br >\n";
echo 'urlencode(bstr):' . urlencode($bstr) . "<br >\n";