<?

$words = array( 'apple', 'orange' );
$whereClause = '';
foreach( $words as $word) {
   $whereClause .= ' content LIKE "%' . $word . '%" OR';
}

// Remove last OR
$whereClause = substr($whereClause, 0, -2);

$sql = 'SELECT FROM yourtable WHERE' . $whereClause;

echo $sql;

?>

SELECT FROM yourtable WHERE content LIKE "%apple%" OR content LIKE "%orange%"