iterate through names of columns in result set pdo
//Connect to MySQL using PDO.
$pdo = new PDO("mysql:host=$host;dbname=$database", $user, $password);
//Create our SQL query.
$sql = "SELECT * FROM my_table_name LIMIT 20";
//Prepare our SQL query.
$statement = $pdo->prepare($sql);
//Executre our SQL query.
$statement->execute();
//Fetch all of the rows from our MySQL table.
$rows = $statement->fetchAll(PDO::FETCH_ASSOC);
//Get the column names.
$columnNames = array();
if(!empty($rows)){
//We only need to loop through the first row of our result
//in order to collate the column names.
$firstRow = $rows[0];
foreach($firstRow as $colName => $val){
$columnNames[] = $colName;
}
}