Different results between PHP md5() and Ruby Digest::MD5.hexdigest -

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i wanted pass md5 hash generated ruby program php program, , found strange.

ruby code(result: ad0efdf609e99ec50d9333dc0bd1c11a)

digest::md5.hexdigest 'test str1&test str2&test str3&test str4'

php code(result: 804160119894a4cc8c376fffbcc21e1c)

php online md5 generator

you can see results different... if remove "&" in string:

ruby code(result: 45fa91e4c89aa6f3bb501531a5de6bf4)

digest::md5.hexdigest 'test str1test str2test str3test str4'

php code(result: 45fa91e4c89aa6f3bb501531a5de6bf4)

php online md5 generator

they same. why did happen? md5 algorithm should same in language, shouldn't it?

the results of website wrong.

here comes example (using php on command line):

php -r 'echo md5("test str1&test str2&test str3&test str4");'

output:

ad0efdf609e99ec50d9333dc0bd1c11a

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