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string random_bytes ( int $length )

<?php
$bytes = random_bytes(5);
print(bin2hex($bytes));
?>

6f36d48a29

int random_int ( int $min , int $max )

<?php
print(random_int(100, 999));
print(PHP_EOL);
print(random_int(-1000, 0));
?>

723
-64