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PHP random number generation code and usage example analysis_PHP tutorial
PHP random number generation code and usage example analysis_PHP tutorial
We can also use random numbers to design any program structure we can imagine.
First, let’s get to know the random number function rand() provided by PHP. PHP's rand() function will return a random integer. The specific usage method is as follows
rand(min,max)
The optional parameters min and max can make rand() return between 0 and RAND_MAX of pseudo-random integers. For example, if you want a random number between 5 and 15 (inclusive), use rand(5, 15).
Let me look at a specific example below. We make a basic function call without setting specific parameters. The random number we get will not be limited by the min and max parameters.
Result obtained: 652696728 (random result) 1. Use PHP to generate a random number within a specified interval. If we want to generate a random number between two numbers, we need to set two parameters for rand: In this way, we The result is under our control, it should be MinNum <= result <= MaxNum; assuming we want to use PHP to generate a random number between 10000 and 2000, our code should be written like this:
echo(rand(1000,2000));?>
It's simple enough, here comes something a little more difficult. At the beginning of this article, we said that random numbers are very useful. We can use PHP random numbers to solve some complex problems. 2. Use PHP to obtain a random element in a collection. Suppose we need to obtain a random element from an array
$my_array=array('ASP','PHP','JAVASCRIPT','AJAX','CSS','JQUERY','HTML');
echo($my_array[rand(0 ,6)]);
?>
It is conceivable that the result we get may be any element contained in the array such as ASP, PHP or JavaScript. Note that our my_array array contains seven elements, and we set the argument to rand() to be between 0 and 6. Next, we use two sets of random numbers to enhance the function of the above example. We need one random number for conditional judgment and another random number for the output of the element.
$my_array=array('ASP','PHP','JAVASCRIPT',' AJAX','CSS','JQUERY','HTML');
$repetition=rand(0,6);
for($i=0;$i<=$repetition;$i++){
echo('I am learning ' . $my_array[rand(0,6)]);
echo(' on BKJIA.com');
}
?>
The result we get may look like this:
The first time we run it we get three results
Since we use a random number to limit the number of displayed articles, the results obtained are not only random articles, but also the number of displayed articles, as shown below:
The second run got seven results
Maybe you will ask, can PHP random numbers only do these boring things? rand() does not seem to be that important; you are wrong, think about the verification codes that can be seen everywhere, and the random article extraction of some CMS systems , download address allocation, etc. Random numbers play an important role in these applications; in addition, in the fields of security and algorithms, many applications of random numbers are also worthy of our in-depth study, such as encryption and congruence structures.
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