What are the potential security risks or vulnerabilities associated with using methods like fopen() to read source code from external URLs in PHP?

Using methods like fopen() to read source code from external URLs in PHP can pose security risks such as allowing remote code execution, exposing sensitive information, and potential attacks like directory traversal. To mitigate these risks, it is recommended to use more secure methods like cURL to fetch remote content and properly sanitize and validate any input received from external sources. 

$url = "https://example.com/source_code.php";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);

if ($output === false) {
    // Handle error
} else {
    // Process the fetched source code
}

Keywords

fopen security risks vulnerabilities external URLs source code

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