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Using the rand() function: The rand() function generates a pseudo-random number between a given range, or between 0 and the default maximum (getgrandmax()), which is system dependent.Syntax:int rand ($min, $max)Parameters:the rand() function takes two optional parameters as above and described below.
- $min: is an optional parameter used to set the lower limit for the random number. The default min is 0.
- $max:This is an optional parameter used to set an upper limit for the random number. The default is max - this is the return value of getgrandmax(), which is system dependent (for Windows it is 32767).
// PHP program for generating a random number
// within the specified range
// Generate random numbers without a range
// the rand() function returns a random number
$num1
= rand();
echo
" Random number: "
.
$num1
.
""
;
// Generate random numbers in a given range
$num2
= rand (7, 100);
echo
"Random number in range (7, 100):"
,
$num2
;
?>
Exit:Random number: 77551982 Random number in range (7, 100): 37
Note.The rand() function - it is a pseudo-random function which means that it takes a seed from the machine and generates a number according to it. Thus, the method for generating numbers is not completely random. This can be tracked to a certain extent. So it is not cryptographically secure. It is not used for cryptography where randomization is very important. Use the random_int() function to generate a cryptographically secure random number. Using the random_int() function: random_int() is used to generate cryptographically secure random numbers. These numbers can be used for objective results. CryptGenRandom() function on Windows and getrandom (2) system call on Linux to generate a random number.Syntax:int random_int ($min, $max)
Parameters:The random_int() function takes two parameters as above and described below. - $min: contains the lower limit of the random number.
- $max:contains the upper limit of the random number.
Program 2: Generate random numbers in a range using the random_int() function.
// PHP program for generating a random number
// in a given range
// Generate random numbers in a given range
// using the random_int() function
$num1
= random_int (35 , 100);
echo
" Random number in range (35, 100): "
.
$num1
.
""
;
// Random number in the range (10, 30)
$num2
= random_int (10, 30);
echo
" Random number in range (10, 30): "
.
$num2
;
?>
Exit:Random number in range (35, 100): 93 Random number in range (10, 30): 28
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Julia Nickolson
Tallinn | 2023-03-22
Thanks for explaining! I was stuck with PHP program to generate a random number in a given range (min, max) for some hours, finally got it done 🤗. I just hope that will not emerge anymore
Chen Gonzalez
Moscow | 2023-03-22
Simply put and clear. Thank you for sharing. PHP program to generate a random number in a given range (min, max) and other issues with code Python module was always my weak point 😁. I just hope that will not emerge anymore
Anna Zelotti
London | 2023-03-22
StackOverflow is always a bit confusing 😭 PHP program to generate a random number in a given range (min, max) is not the only problem I encountered. Will use it in my bachelor thesis
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