What are common reasons for a PHP form not saving data as expected?

Common reasons for a PHP form not saving data as expected include incorrect form field names, missing form submission handling code, or database connection errors. To solve this, ensure that the form field names in the HTML form match the names in the PHP script, handle form submission using isset() or $_POST, and check for any database connection issues. 

<?php
// Check if form is submitted
if(isset($_POST['submit'])){
    // Retrieve form data
    $data = $_POST['data'];

    // Connect to database
    $conn = new mysqli('localhost', 'username', 'password', 'database');

    // Insert data into database
    $sql = "INSERT INTO table_name (column_name) VALUES ('$data')";
    $conn->query($sql);

    // Close database connection
    $conn->close();
}
?>

<form method="post" action="">
    <input type="text" name="data">
    <input type="submit" name="submit" value="Submit">
</form>

Keywords

PHP form submission data saving database connection validation errors

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