What are common issues with passing form data between files in PHP?

Common issues with passing form data between files in PHP include not properly using sessions or cookies to store and retrieve the data, not correctly setting up the form action attribute, and not properly sanitizing and validating the form data before processing it. To solve these issues, ensure that sessions or cookies are being used to pass the data between files, set the form action attribute to the correct file that will handle the form submission, and validate and sanitize the form data before using it in your PHP code. 

// File 1: form.php
<form action="process_form.php" method="post">
    <input type="text" name="username">
    <input type="password" name="password">
    <button type="submit">Submit</button>
</form>

// File 2: process_form.php
<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Validate and sanitize form data
    // Process the form data
}

Keywords

form data PHP file passing data transfer errors

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