What potential issue could arise with the variable passing between the two PHP files in the code snippet?

The potential issue that could arise is that the variable passed from one PHP file to another may not be properly sanitized, leading to security vulnerabilities such as SQL injection or cross-site scripting attacks. To solve this issue, it is important to sanitize and validate the input data before using it in the second PHP file. 

// First PHP file (file1.php)
$variable = $_POST['input_variable']; // Assuming the variable is coming from a form input

// Sanitize the input variable
$clean_variable = filter_var($variable, FILTER_SANITIZE_STRING);

// Pass the sanitized variable to the second PHP file using a GET parameter
header("Location: file2.php?clean_variable=" . urlencode($clean_variable));
exit;
```

```php
// Second PHP file (file2.php)
$clean_variable = $_GET['clean_variable'];

// Use the sanitized variable safely in your code
echo "Sanitized variable: " . $clean_variable;

Keywords

variable passing PHP files code snippet scope global variables

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