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