How to Loop Through MySQL Query Results with Dynamic Parameters Using PDO in PHP?

Looping through a MySQL Query via PDO in PHP

In your quest to transition from mysql_ functions to PDO functions, you encounter a hurdle in looping through query results with dynamic parameters. Let's unravel the solution.

The initial approach for looping through results without parameters is straightforward:

<code class="php">foreach ($database->query("SELECT * FROM widgets") as $results) {
   echo $results["widget_name"];
}</code>

However, when dealing with dynamic parameters, a different approach is needed. To do this, we utilize PDO's parameterization capabilities, which offer several benefits, including improved security and performance.

Here's an example using PDO to connect to the database, configure error handling, and prepare a statement with placeholders:

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

// Ensure PDO throws exceptions for errors
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// Prepare the query with named placeholders
$stmt = $pdo->prepare("SELECT * FROM widgets WHERE something=:something");

// Bind values to placeholders
$stmt->bindValue(":something", $dynamicValue); // Replace 'something else' with your dynamic value

// Execute the query
$stmt->execute();

// Loop through the results and retrieve data
$results = array();
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    $results[] = $row;
}</code>

By using parameterization, you ensure that your queries are secure and performant, while also making it easy to loop through the results and access the desired data.

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