Can PHP's MD5 result be converted to binary Base64 encoding to shorten the length?

The problem is roughly title, simple binary conversion seems to only get 0 and 1 of the string, not binary data, want to know how to write this code, can try to use PHP built-in functions to implement

The goal is to generate a shorter unique identity, before the use of MD5 again to determine whether to repeat, but the MD5 result is a 32-bit 16 binary string, or a bit long, so want to turn into a 64 binary string, do not know my thinking there is no error?

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The problem is roughly title, simple binary conversion seems to only get 0 and 1 of the string, not binary data, want to know how to write this code, can try to use PHP built-in functions to implement

The goal is to generate a shorter unique identity, before the use of MD5 again to determine whether to repeat, but the MD5 result is a 32-bit 16 binary string, or a bit long, so want to turn into a 64 binary string, do not know my thinking there is no error?

Resolved by itself:

function base64md5 ($str) { return base64_encode(md5($str, 1));}

PS: Roughly as above, the phone writes the code, does not guarantee the correct ...

You can use the 16-bit MD5.

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