What potential issues could arise when passing variables between PHP files in a web application?

One potential issue that could arise when passing variables between PHP files in a web application is the risk of data manipulation or injection if proper validation and sanitization are not implemented. To solve this, always validate and sanitize user input before passing it between PHP files to prevent security vulnerabilities. 

// Example of validating and sanitizing input before passing it between PHP files
$input_variable = $_POST['input_variable'];

// Validate and sanitize the input
$validated_variable = filter_var($input_variable, FILTER_SANITIZE_STRING);

// Pass the validated and sanitized variable to another PHP file
include 'another_file.php';

Keywords

variable scope include statement global keyword session variables data leakage

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