How to get random array in php? Various methods of analysis

PHP is a very popular programming language that has become one of the preferred languages ​​for many developers due to its flexibility and ease of use. In PHP, random array is a very common operation. For example, we need to randomly select several elements in an array, or we need to randomly generate an array to simulate some data. So, how does PHP get a random array? This article will introduce it to you in detail.

Method 1: shuffle function

The shuffle function is one of the functions in PHP used to randomly sort arrays. We can use this function to generate a random array. The following is a sample code:

$my_array = array("a", "b", "c", "d", "e");
shuffle($my_array);
print_r($my_array);

This code will print out a randomly ordered array, for example: array("d", "a", "e", "b", "c"). We can use this method to generate random arrays.

Method 2: array_rand function

Another function that can be used to obtain a random array is the array_rand function. This function randomly selects several elements in an array and returns the keys where these elements are located. Here is the sample code:

$my_array = array("a", "b", "c", "d", "e");
$rand_keys = array_rand($my_array, 3);
foreach($rand_keys as $key){
  echo $my_array[$key] . "\n";
}

This code will print out three randomly selected elements. For example: b,c,d.

Method 3: range function

Another way to generate a random array is to use the range function. This function can be used to generate an integer array within a specified range. The following is a sample code:

$my_array = range(1, 10);
shuffle($my_array);
print_r($my_array);

This code will generate an integer array from 1 to 10 and use the shuffle function to randomly sort it. For example: array(5, 1, 9, 3, 8, 2, 7, 10, 6, 4).

Method 4: for loop generation

The last way to generate a random array is to use a for loop. We can use a for loop to generate a random array. Here is the sample code:

$my_array = array();
for($i=0;$i<10;$i++){
  $my_array[] = rand(1, 100);
}
print_r($my_array);

This code will generate an array containing 10 random integers. For example: array(72, 11, 56, 34, 72, 89, 19, 43, 84, 98).

Summary

In PHP, we can use a variety of methods to obtain a random array. The four methods listed above are relatively simple and easy to learn. You can choose the corresponding method according to your actual needs. Hope this article can be helpful to you.

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