Difference between rand and mt_rand

We use rand() function to randomly generate a number.Now php has come up with another more powerful function named mt_rand. it is 10 times faster than the rand function. In php 5.2.1, Mersenne Twister algorithm uses a new seeding algorithm developed by Richard Wagner. Now identical seeds will not produce same results. mt_rand has the following defination:

mt_rand([int min], [int max]);

if we omit those values, it will product from 0 to mt_getrandmax() values. If we want to show a random number from 5 to 15 inclusive, then we need to write it like the following:

mt_rand(5,15);

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