rand() to generate random integer in PHP

echo rand(); // Random Output 16513

echo rand(8,10); // Random Output starting from 8 to 10

Syntax

rand ( min,max);

min ,max : (Optional) Minimum and maximu value ( both inclusive ) of random integer to be generated ( both to be given )

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"; 
?>

Output is here

Random Value = 33369

Example: 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 value

How to generate random string having alphabets and digits

Math Functions random_int(): cryptographically secure pseudo-random integers Rounding off value

Subhendu Mohapatra

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rand(): Random integer generator

Random number of different length

Example: Generating Random Floats

Example: Seeding Random Number Generator

Example: Resetting the Seed

Subhendu Mohapatra