- implode: documentation ( source)
<?php
$words = array('banana', 'apple', 'orange');
$arr = array();
foreach($words as $keyword) {
$link = "http://localhost/site".'/?s='.$keyword;
$arr[] = '<a href="'.$link.'" title="'.$keyword.'">'.$keyword.'</a>';
}
echo implode(' | ', $arr);