How to Shuffle & Echo 5 Random Elements from a String?

问题

a question about getting three random words out of a big string of say 200 words:

$trans = __("water paradise, chicken wing, banana beach, tree trunk")?>
// $trans becomes "water paradijs, kippenvleugel, bananen strand, boom tak"
// elements are separated by comma's and a space

Now imagine I want to get 5 random elements from that $trans string and echo that.
How can I do that? Code is welcome! Please keep this syntax in your answer:

$trans = the original string

$shufl = selective shuffle of 5 elements contains e.g kippenvleugel, boom tak

回答1:

You can do this by creating an array of strings using split, and then shuffling it with shuffle:

# Split the string into different elements
$strings = split(',', $trans);
# Shuffle the array
shuffle($strings);

# Select 5 elements
$shufl = array_slice($strings,  0, 5);

array_slice is then used to get the first 5 elements of the shuffled array. Another possibility is to use array_rand on the split array:

$shufl = array_rand(array_flip($strings), 5);

回答2:

$array = explode ( ',',$trans);
shuffle($array);
for ( $i = 0 ; $i < 5 ; $i ++ ){
   $shufl[] = $array[$i];
}

This will result in a $shufl array containing your 5 random elements.

Hope this helps :)

回答3:

For better understanding. What is a random string?

Can it be:

• 'water paradijs' 'kippenvleugel' 'bananen strand'

or can it also be

• 'water strand' 'kippenvleugel bananen', etc.

?

来源：https://stackoverflow.com/questions/5156428/how-to-shuffle-echo-5-random-elements-from-a-string