Use rand() function to generate a random number in PHP

During the use of PHP, in some special circumstances, we may need to generate some random numbers for our use in certain scenarios. PHP has a built-in rand() function to help us solve this problem. This article will take you to take a look.

The first thing we need to understand is the syntax of the rand() function:

rand ( int $min   , int $max  )

• $min: Optional parameter, must be at the same time as $max Used to represent the minimum value of the generated number
  

• $max: Optional parameter, which must be used together with $min, to represent the maximum value of the generated number

• Return value: Returns an int value. If there are parameters, it returns $min to $max (including $min and $max). If there are no parameters, rand() returns 0 to getrandmax() Pseudo-random integers between (getrandmax() is the largest possible value for displaying random numbers)

Code example:

1. The function has no parameters

<?php
echo rand();

输出：312803035//随机性，值不同

2. The function has parameters

<?php
echo rand(10,100);

输出:15//随机性，值不同

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