How to Properly Insert NULL Values into MySQL using PHP Prepared Statements?

PHP/MySQL: Inserting Null Values

When inserting data into a MySQL database using PHP, it can be tricky to handle null values correctly. If a field is nullable, but an array value is null, the insertion may not occur.

To resolve this issue, it's recommended to use prepared statements with PHP's mysqli extension. Here's how to do it:

$stmt = $mysqli->prepare("INSERT INTO table2 (f1, f2) VALUES (?, ?)");

This statement creates a prepared query with two placeholders, ?.

$stmt->bind_param('ss', $field1, $field2);

The bind_param method assigns variables to the placeholders. The first parameter specifies the data types (in this case, strings), and the following parameters are the variables that will hold the values.

$field1 = "String Value";
$field2 = null;

Set the variable values as needed, with null for nullable fields.

$stmt->execute();

Finally, execute the statement. Prepared statements automatically handle null values correctly, converting empty strings to null if necessary.

By using prepared statements, you can avoid the need to manually check for null values and add single quotes to strings. This makes the insertion process more efficient and protects against SQL injection vulnerabilities.

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