CRYPT_SHA512 is generating same hash value for multiple inputs

Hi,

I see that when I am applying crypt function on the text 'samurai.ciscorouter1', output is same as it is for 'samurai.ciscorouter2'. Is the code I am giving how it must be?

print "<hr/>" .crypt(crypt(crypt('samurai.ciscorouter1',CRYPT_SHA512), CRYPT_SHA512), 
CRYPT_SHA512); 

print "<hr/>" .crypt(crypt(crypt('samurai.ciscorouter2',CRYPT_SHA512), CRYPT_SHA512), 
CRYPT_SHA512);