Can the md5 result of PHP be converted to binary and then base64 encoded to shorten the length?

The question is roughly the same as the title. Simple hexadecimal conversion seems to only get strings of 0 and 1, not binary data. I hope to know how to write this code. Can I try to use PHP’s built-in functions to achieve it

The purpose is to generate a shorter unique identifier. Previously, md5 was used to determine whether it is duplicated, but the md5 result is a 32-digit hexadecimal string, which is still a bit long, so I want to convert it to a 64-digit string. I don’t know. Are there any mistakes in my thinking?

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The question is roughly the same as the title. Simple hexadecimal conversion seems to only get strings of 0 and 1, not binary data. I hope to know how to write this code. Can I try to use PHP’s built-in functions to achieve it

The purpose is to generate a shorter unique identifier. Previously, md5 was used to determine whether it is duplicated, but the md5 result is a 32-digit hexadecimal string, which is still a bit long, so I want to convert it to a 64-digit string. I don’t know. Are there any mistakes in my thinking?

Solved it by myself:

<code>function base64md5 ($str) {
 return base64_encode(md5($str, 1));
}</code>

ps: It’s roughly the same as above. The code written on the mobile phone is not guaranteed to be correct...

You can use 16-bit md5.