PHP randomly selects one or more elements from an array to return the key name of the function Array_rand ()

Instance

Returns an array that contains a random key name:

<?php$a=array ("Red", "green", "blue", "yellow", "brown"), $random _keys=array_rand ($a, 3), echo $a [$random _keys[0]]. " <br> "echo $a [$random _keys[1]]." <br> "echo $a [$random _keys[2]];? >

Definition and usage

The Array_rand () function returns a random key name in the array, or returns an array containing a random key name if the specified function returns more than one key name.

Grammar

Array_rand (Array,number)

Parameters	Describe
Array	Necessary. Specifies the array.
Number	Optional. Specifies how many random elements are returned.

Technical details

return value:	Returns a random key name in the array, or returns an array containing a random key name if the specified function returns more than one key name.
php version:	4+
update log:	since PHP 5.2.10, the result array of the key name is no longer ay of the keys is no longer shuffled. Since PHP 4.2.0, the random number generator will be seeded automatically.

More examples

Example 1

Returns a random key name in the array:

<?php$a=array ("A" = "red", "b" = "green", "c" = "Blue", "D" and "Yellow");p Rint_r (Array_rand ($a, 1));? >

Example 2

Returns an array containing a random string key name:

<?php$a=array ("A" = "red", "b" = "green", "c" = "Blue", "D" and "Yellow");p Rint_r (Array_rand ($a, 2));? >

Example:

<?php $a =array ("a" = "Dog", "b" = "Cat", "C" and "Horse"); Print_r (Array_rand ($a, 1));?>

Results:

B