How do I iterate through MySQL query results using PDO in PHP with dynamic parameters?

Iterating MySQL Query Results with PDO in PHP

In transitioning from mysql_ to PDO functions, understanding how to navigate query results with dynamic parameters is crucial. While standard result iteration is straightforward, difficulties arise when incorporating dynamic values.

To address this, consider using parameterized statements, which offer enhanced debugging and security benefits. Here's an example:

<code class="php">// Connect to PDO
$pdo = new PDO("mysql:host=localhost;dbname=test", "user", "password");

// Enable exception handling for improved debugging
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// Prepare parameterized statement
$stmt = $pdo->prepare("SELECT * FROM widgets WHERE something=:dynamic_value");

// Bind dynamic value to placeholder
$stmt->bindValue(":dynamic_value", 'something else');

// Execute statement
$stmt->execute();

// Initialize result array
$results = array();

// Iterate over results
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    $results[] = $row;
}</code>

In this example, the :dynamic_value placeholder allows you to substitute dynamic values without compromising security or debugging capabilities. Remember to handle exceptions appropriately for optimal code stability.

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