Why does using implode as a parameter in a prepared statement cause unexpected results in PHP?

Using implode as a parameter in a prepared statement causes unexpected results because implode joins array elements into a string, which may not be suitable for inserting into a database query. To solve this issue, you should bind each element of the array separately in the prepared statement. 

// Example of binding each element of an array separately in a prepared statement
$ids = [1, 2, 3, 4];

// Create a placeholder for each element in the array
$placeholders = implode(',', array_fill(0, count($ids), '?'));

// Prepare the statement with individual placeholders
$stmt = $pdo->prepare("SELECT * FROM table WHERE id IN ($placeholders)");

// Bind each element of the array separately
foreach ($ids as $key => $id) {
    $stmt->bindValue($key + 1, $id);
}

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

Keywords

implode prepared statement unexpected results PHP parameter

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