rand(): Random integer generator

echo rand(); // Random Output 16513
echo rand(8,10); // Random Output starting from 8 to 10 
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
for($i=1; $i<=$no_of_digits; $i++){
$var .=rand(0,9);
echo "<br>Random Value = $var"; 
Output is here
Random Value = 33369
How to generate random string having alphabets and digits

Math Functions random_int(): cryptographically secure pseudo-random integers Rounding off value
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    how to generate the random number in php

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