What are some best practices for structuring SQL queries in PHP to filter results based on specific criteria?

When structuring SQL queries in PHP to filter results based on specific criteria, it is important to use parameterized queries to prevent SQL injection attacks. Additionally, it is recommended to use prepared statements for better performance and security. Lastly, consider using placeholders in the query to dynamically insert the filter criteria. 

// Example of structuring SQL query in PHP to filter results based on specific criteria
$pdo = new PDO('mysql:host=localhost;dbname=test_db', 'username', 'password');

// Define the filter criteria
$filter_criteria = 'example_criteria';

// Prepare the SQL query with a placeholder for the filter criteria
$stmt = $pdo->prepare('SELECT * FROM table_name WHERE column_name = :filter_criteria');

// Bind the filter criteria to the placeholder
$stmt->bindParam(':filter_criteria', $filter_criteria);

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

// Fetch the filtered results
$results = $stmt->fetchAll();

// Loop through the results
foreach ($results as $result) {
    // Output or process the filtered results
}

Keywords

SQL queries PHP filtering criteria structuring

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