How could I echo 5 elements randomly from an array of about 20?
Thanks.
A:
for($i=0; $i++; $i < 5)
{
echo $array[rand(0, count($array)-1);
}
or
for($i=0; $i++; $i < 5)
{
echo array_rand($array);
}
or
array_map("echo", array_rand($array, 5));
njk
2010-01-22 16:48:23
There is a change here that you would pick the same element more than once, which is probably not what the OP wants.
Neil Aitken
2010-01-22 16:50:59
The point of array_map is to *create a new array* by applying a function to each item of an existing array. If all you want to do is apply the function, use array_walk.
bish
2010-01-22 17:15:30
+1
A:
Does this work?
$values = array_rand($input, 5);
Or, as a more flexible function
function randomValues($input, $num = 5) {
return array_rand($input, $num);
}
//usage
$array = range('a', 'z');
//prints 5 random characters from the alphabet
print_R(randomValues($array));
davethegr8
2010-01-22 16:49:07
A:
$n = number of random numbers to return in the array
$min = minimum number
$max = maximum number
function uniqueRand($n, $min = 0, $max = null)
{
if($max === null)
$max = getrandmax();
$array = range($min, $max);
$return = array();
$keys = array_rand($array, $n);
foreach($keys as $key)
$return[] = $array[$key];
return $return;
}
$randNums = uniqueRand(5, 0, count($array)-1);
for($i=0; $i++; $i < 5)
{
echo $array[$randNums[i]);
}
CJ
2010-01-22 16:58:57