What are the security implications of including variables from external files in PHP scripts?

Including variables from external files in PHP scripts can pose security risks such as code injection and exposing sensitive information. To mitigate these risks, it is important to validate and sanitize any input from external files before using them in your script. 

// Example of including and sanitizing variables from an external file
$externalData = include 'external.php';

// Validate and sanitize the included data
if (is_array($externalData)) {
    $safeData = array_map('htmlspecialchars', $externalData);
    // Use the sanitized data in your script
}

Keywords

security implications variables external files PHP scripts vulnerabilities

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