columncount : Number of Columns Present in the query

<?Php
require "config.php"; // Database connection string

$count=$dbo->prepare("select * from pdo_admin ");
$count->execute();
echo "Number of Columns : ". $count->columnCount();
?>

Number of Columns : 5

$count=$dbo->prepare("select id,userid from pdo_admin ");

Number of Columns : 2

Example 1: Using PDO::columnCount() After a SELECT Query

This example demonstrates how to use PDO::columnCount() after executing a SELECT query.

$stmt = $pdo->query("SELECT name, age, gender FROM users");
$columnCount = $stmt->columnCount();
echo "Number of columns: " . $columnCount;

Number of columns: 3

Example 2: Checking Column Count for Different Queries

This example shows how the number of columns varies based on the SQL query.

$stmt = $pdo->query("SELECT * FROM users WHERE age > 18");
$columnCount = $stmt->columnCount();
echo "Column count for this query: " . $columnCount;

Column count for this query: 5

Example 3: Fetching Column Names Dynamically

Use columnCount() to fetch column names dynamically after a query.

$stmt = $pdo->query("SELECT * FROM users");
$columnCount = $stmt->columnCount();

for ($i = 0; $i < $columnCount; $i++) {
    $colMeta = $stmt->getColumnMeta($i);
    echo "Column name: " . $colMeta['name'] . "<br>";
}

Column name: id
Column name: name
Column name: age
Column name: gender