PHP srand() – Seeding the Random Number Generator
This article explains PHP's srand() function, detailing its purpose of seeding the random number generator, optional seed parameter, lack of return value, and provides a complete example showing how to generate a seed from microtime and produce random numbers.
The srand() function seeds PHP's random number generator with an optional integer seed; if the seed is omitted, a value derived from the current time is used.
Parameters int $seed – optional seed value.
Return value
None (void).
Example
<?php
// seed with microseconds
function make_seed() {
list($usec, $sec) = explode(' ', microtime());
return (float)$sec + ((float)($usec) * 100000);
}
srand(make_seed());
$randval = rand();
?>Signed-in readers can open the original source through BestHub's protected redirect.
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