How can PHP developers optimize database queries to improve overall application efficiency?

PHP developers can optimize database queries by using indexes on columns frequently used in WHERE clauses, avoiding unnecessary queries by caching results, using parameterized queries to prevent SQL injection attacks, and minimizing the number of queries by combining multiple operations into a single query where possible. 

// Example of optimizing a database query by using indexes on columns
$query = "SELECT * FROM users WHERE username = :username";
$stmt = $pdo->prepare($query);
$stmt->bindParam(':username', $username, PDO::PARAM_STR);
$stmt->execute();

Keywords

MySQL indexing query optimization PDO caching

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