rand(): Random integer generator
echo rand(); // Random Output 16513echo rand(8,10); // Random Output starting from 8 to 10 rand ( min,max);We can generate random value by using rand() PHP. We can specify a range and the random value between those two ranges (inclusive) will be generated.
This output is not cryptographically secure values , so for cryptographically secure value, consider using random_int(), random_bytes
Note that here we are generating a random number only. To get any random characters we can use arrays. The details on how to generate random characters is available here.
Random number of different length
We can create a script to generate random number of different length. Let us try to develop a script to print random number of 5 character length.Here it is
<?Php
$no_of_digits=5;
$var='';
for($i=1; $i<=$no_of_digits; $i++){
$var .=rand(0,9);
}
echo "<br>Random Value = $var";
?>Random Value = 33369Example: Generating Random Floats
$random_float = mt_rand() / mt_getrandmax();
echo $random_float;
Example: Seeding Random Number Generator
mt_srand(123); // Seed the generator
echo mt_rand()."<br>"; // Output: Same number every time the script is run
echo mt_rand(); // Output: Same number every time the script is run
Example: Resetting the Seed
mt_srand(987);
echo mt_rand(); // Output will change with a different seed valueHow to generate random string having alphabets and digits
Math Functions random_int(): cryptographically secure pseudo-random integers Rounding off value
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| princy | 02-02-2012 |
| how to generate the random number in php | |
