- shuffle: documentation ( source)
- array_keys: documentation ( source)
<?php
$wl = array(
'word2' => 'link2.com',
'word3' => 'link3.com',
'word4' => 'link4.com',
'word5' => 'link5.com'
);
$newarr = array_keys($wl);
shuffle($newarr);
echo $newarr[0] . " - " . $wl[$newarr[0]];