What are some common pitfalls when trying to execute multiple SQL statements in PHP?

One common pitfall when trying to execute multiple SQL statements in PHP is not using prepared statements, which can leave your code vulnerable to SQL injection attacks. To solve this issue, always use prepared statements to safely execute multiple SQL statements in PHP. 

// Example of executing multiple SQL statements using prepared statements

// Establish a connection to the database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare the SQL statements
$stmt1 = $pdo->prepare("SELECT * FROM table1 WHERE id = :id");
$stmt2 = $pdo->prepare("SELECT * FROM table2 WHERE id = :id");

// Bind parameters and execute the first statement
$stmt1->bindParam(':id', $id);
$stmt1->execute();

// Bind parameters and execute the second statement
$stmt2->bindParam(':id', $id);
$stmt2->execute();

// Fetch results
$results1 = $stmt1->fetchAll();
$results2 = $stmt2->fetchAll();

// Process the results as needed

Keywords

SQL injection mysqli_multi_query PDO prepared statements transaction handling

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