What potential security risks are involved in allowing external file access in PHP?

Allowing external file access in PHP can pose security risks such as exposing sensitive information, executing malicious code, and potentially compromising the server. To mitigate these risks, it is important to validate user input, sanitize file paths, and restrict access to only necessary files. 

$file = '/path/to/file.txt';

if (strpos($file, '/path/to/') === 0) {
    // Access allowed
    $content = file_get_contents($file);
    echo $content;
} else {
    // Access denied
    echo 'Access denied';
}

Keywords

File access PHP security risks external vulnerabilities

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