What are the common errors or syntax issues that PHP developers may encounter when passing variables from HTML forms to PHP scripts for processing and redirection?

One common issue is not properly sanitizing user input from HTML forms, which can lead to security vulnerabilities such as SQL injection attacks. To solve this, always use functions like `htmlspecialchars()` or `mysqli_real_escape_string()` to sanitize user input before using it in SQL queries. 

// Sanitize user input from HTML form
$username = htmlspecialchars($_POST['username']);
$password = htmlspecialchars($_POST['password']);

// Or using mysqli_real_escape_string() for SQL queries
$username = mysqli_real_escape_string($conn, $_POST['username']);
$password = mysqli_real_escape_string($conn, $_POST['password']);

Keywords

HTML forms PHP scripts variable passing syntax errors redirection

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