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php The rand() function is used to generate random integers within a specified range. The syntax is "rand(min,max)". The parameter min specifies the minimum number in the range, and the parameter max specifies the maximum number in the range; if not If the parameters are specified, a pseudo-random integer between 0 and RAND_MAX is returned.
How to use the rand() function?
Function: Get a random number from the parameter range
Syntax:
rand(min,max)
Parameter:
min, indicating the minimum number in the range
max, represents the maximum number in the range
Note: If the optional parameters min and max are not provided, rand() returns a pseudo-random integer between 0 and RAND_MAX. For example, if you want a random number between 5 and 15, inclusive, use rand(5, 15).
php rand() function example 1
<?php $i = 1; $j = 9; $k = rand($i,$j); echo "取得的随机数为".$k; ?>
Output:
随机输出1-9之间的一个整数
php rand() function example 2
<?php echo rand(1,100); ?>
Output:
随机输出1-100之间的一个整数
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