What are the security implications of including external content in PHP using methods like file_get_contents?

When including external content in PHP using methods like file_get_contents, there are security implications such as the risk of executing malicious code or exposing sensitive information. To mitigate these risks, it is important to validate and sanitize the external content before including it in your code. 

$url = 'https://example.com/data.json';
$contents = file_get_contents($url);

// Validate and sanitize the external content
if ($contents !== false) {
    $sanitized_contents = filter_var($contents, FILTER_SANITIZE_STRING);
    
    // Use the sanitized content in your code
    echo $sanitized_contents;
} else {
    echo 'Error fetching external content.';
}

Keywords

security implications external content file_get_contents PHP injection vulnerabilities

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