mt_srandPHP ManualPrevNextmt_srandmt_srand -- seed the better random number generatorDescriptionvoid mt_srand(int seed); Seeds the random number generator with seed. 1  2 // seed with microseconds since last "whole" second 3 mt_srand((double)microtime()*1000000); 4 $randval = mt_rand(); 5  See also mt_rand(), mt_getrandmax(), srand(), rand() and getrandmax().PrevHomeNextmt_randUpmt_getrandmax