How to Avoid 'Array to String Conversion' Errors When Inserting Multiple Rows with PDO?

PDO MySQL: Inserting Multiple Rows with a Single Query

Inserting multiple rows into a database with a single query can improve efficiency and performance. In PHP, PDO (PHP Data Objects) provides a convenient way to execute such queries using placeholders and prepared statements.

Problem: Array to String Conversion Error

When attempting to execute a query with multiple rows using PDO, you may encounter an error like "Array to string conversion" if the data is not properly bound to the placeholders.

Solution: Iterating over Data

To fix this error, you need to iterate over each data item and bind the individual values to the corresponding placeholders in the prepared statement. Here's an example:

$stmt = $pdo->prepare('INSERT INTO table (key1, key2) VALUES (:key1, :key2)');
foreach($data as $item) {
    $stmt->bindValue(':key1', $item['key1']);
    $stmt->bindValue(':key2', $item['key2']);
    $stmt->execute();
}

In this example, the prepared statement is iteratively executed for each data item, ensuring that all values are correctly bound.

Alternative Approach: Bulk Bind

Alternatively, you can use PDO's "bulk bind" feature to bind all values at once:

$query = "INSERT INTO table (key1, key2) VALUES ";
$values = array_values($data);
$placeholders = array_fill(0, count($values), "(?, ?)");
$query .= implode(',', $placeholders);
$stmt = $pdo->prepare($query);
$stmt->execute($values);

This approach can be more efficient if you have a large number of rows to insert.

By understanding how to correctly bind data when executing multiple row insert queries, you can efficiently update your database and avoid common errors like array to string conversion.

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