PHP返回随机数组

I am trying to create a new array from an existing one with a random number of records between 2 and 10, I have this so far

//Select a random number
$random_number = (rand(2,10));

// Setup an array of names
$names = array("john", "joe", "simon", "peter", "paul");

// Create new array
$random_field_names = array_rand($names, $random_number);

print_r($random_field_names);

This gives me an array that looks like this

Array
(
    [0] => 0
    [1] => 10
    [2] => 11
)

Where am I going wrong?

The description of array_rand explains why you don't get the names (I stress in bold):

Picks one or more random entries out of an array, and returns the key (or keys) of the random entries.

You seem to want the values. That you can achieve like this:

 array_intersect_key($names,  array_flip(array_rand($names, $random_number)));

Also make sure your random number is not greater than the array size:

$random_number = rand(2,5);
$names = array("john", "joe", "simon", "peter", "paul");
$result = array_intersect_key($names,  array_flip(array_rand($names, $random_number)));
print_r ($result);  

Note that the result maintains the original keys. If you want to renumber the keys to get an indexed array starting with index 0, then apply array_values to the result:

$result = array_values(array_intersect_key($names,  array_flip(array_rand($names, $random_number))));

1. syntax error on line 5 - missing quote after "simon
2. array_rand() returns random key(s), not values
3. rand(2,10) won't work in all cases as there are only 5 entries in the array; from PHP docs: Trying to pick more elements than there are in the array will result in an E_WARNING level error, and NULL will be returned.

If you want to randomize the entire array, use shuffle().

Use the key to get the value you want :

//Select a random number
$random_number = (rand(2,10));

// Setup an array of names
$names = array("john", "joe", "simon", "peter", "paul");

// Create new array
$random_field_names = array_rand($names, $random_number);

print_r($names[$random_field_names]);