What is the analogue in php of the md5 function from perl?

Question

Perl

Hello everyone, there is a script in perl, I rewrite it in php and that's the trouble, the functions do not work the same way =(
I read that md5 in php works like md5_hex in perl, but here's how to make a function that will work similar to the md5 function from pearl.
Here is the code the pearl I'm porting:

use Digest::MD5  qw(md5 md5_hex md5_base64);
$hash  = md5($str1, $str2);

Here's how I try in php but I get a different result(
$hash = md5($str1.$str2);
Tell me guys, how to get the same result in $hash?

Answer 1

md5($str1.$str2, true);

Answer 2

this is from the console, I think in the code you can also somehow write
php -r 'echo crypt("your_password", "salt");'