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PHP Random_int () function

The various sources of randomness used in this function are shown below:
  • Window:The CryptGenRandom() function is used.
  • Linux:the getrandom (2) syscall function is used.
Syntax:
int random_int ($min, $max )
Parameter :
  • $min:returned minimum valueequal to PHP_INT_MIN or higher.
  • $max:returned highest valuethat is less than or equal to PHP_INT_MAX.
Returned value:cryptographically safe random integer in the range from minimum to maximum, inclusive.Examples:
Input: min = 10, max = 10000 Output: int ( 5183) Input: min = -244441, max = 1 Output: int (-60209)
The programs below illustrate the random_int() function in PHP. 
Program 1:
// PHP demo program
// random_int() function 
// specified minimum and maximum range
var_dump (random_int (1, 5555555));
var_dump (random_int (-1, 100000));
var_dump (random_int (9, 10));  
?>
Exit
int (835427) int (86695) int (10)
The programs below illustrate the random_int() function in PHP.Program 2:
When an invalid range is written then runtime errors occur.
// PHP program for demos
// random_int() function  // specified minimum and maximum range
// Invalid range $t = (random_int (99, 11));  
// Print the result echo "(int)" , $t ; ?>
Exit
Runtime Error  Exception error: 
  • Iinvalid parameter gives TypeError .
  • Incorrect byte length gives error .
  • If the source of randomness is not found then an exception will be thrown.
Links:
http://php.net/manual/en/function.random-int.php

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