How to use random numbers in PHP

How to use random numbers in PHP

I want to make a web page that appears randomly, but using rand() doesn't work. I heard that random numbers need to be initialized, but how to initialize them? Please give me some advice, thank you!

//The first step: initialize the seed
$seedarray =microtime();
$seedstr =split(" ",$seedarray,5);
$seed =$seedstr[0]*10000;

//Step 2: Initialize the random number generator using the seed
srand($seed);

//Step 3: Generate random numbers within the specified range
$random =rand(10,40);

The above introduces the method of using random numbers in PHP, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.