unique - PHP's uniqid function with more entropy -

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question:

when using php's uniqid function more entropy set 15th character period (dot) on runs. 15th character guaranteed dot?

follow-up:

thanks @fuzzytree answer.

i investigated bit further, interested php_combined_lcg() function generates random number between 0 , 1 (such 0.862215793). reason there number before decimal because multiplied 10 (which becomes 8.62215793 in example). prevents there being 0 14th character.

yes 15th character guaranteed dot if more_entropy set true.

from php source uniqid

if (more_entropy) {     uniqid = strpprintf(0, "%s%08x%05x%.8f", prefix, sec, usec, php_combined_lcg() * 10);                                        ^ hard coded dot here preceeded 14 characters } else {     uniqid = strpprintf(0, "%s%08x%05x", prefix, sec, usec); }

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