mt_srand(): Seeds the Mersenne Twister Random Number Generator

mt_srand(time());  
echo mt_rand();

void mt_srand ([ int $seed [, int $mode = MT_RAND_MT19937 ]] )

Example 1: Seeding with Current Time

<?php
mt_srand(time());
echo mt_rand();  // Output: A pseudo-random number based on the current time as the seed
?>

Example 2: Using a Fixed Seed for Reproducibility

<?php
mt_srand(123);
echo mt_rand();  // Output: Always returns the same random number
?>

Example 3: Generating a Sequence of Random Numbers with a Seed

<?php
mt_srand(42);
for($i = 0; $i < 5; $i++) {
    echo mt_rand() . "<br>";
}
?>

Example 4: Resetting the Seed with Different Values

<?php
mt_srand(100);
echo mt_rand();  // Output: A specific pseudo-random number
mt_srand(200);
echo mt_rand();  // Output: A different specific pseudo-random number
?>

Example 5: Lottery Simulation with Seed

<?php
mt_srand(7);
$lottery_numbers = [];
for($i = 0; $i < 6; $i++) {
    $lottery_numbers[] = mt_rand(1, 49);
}
echo implode(", ", $lottery_numbers);  // Output: Random lottery numbers
?>

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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