What potential pitfalls should be considered when using the include function in PHP scripts?

When using the include function in PHP scripts, potential pitfalls to consider include security risks such as allowing remote file inclusion, exposing sensitive information, and causing unexpected behavior if the included file is not found or contains errors. To mitigate these risks, it is important to validate user input, sanitize file paths, and use absolute paths instead of relative paths when including files. 

// Example of including a file with absolute path and validating user input
$filename = 'includes/' . $_GET['file']; // Assuming the file is located in the includes directory
if (strpos($filename, '..') === false && file_exists($filename)) {
    include $filename;
} else {
    echo 'Invalid file path';
}

Keywords

include PHP scripts security vulnerabilities file path code injection

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