What are the potential drawbacks of using include in PHP for loading content?

One potential drawback of using include in PHP for loading content is the security risk of including files from external sources without proper validation. This can lead to vulnerabilities such as directory traversal attacks or code injection. To mitigate this risk, it is important to validate the included file path and sanitize user input before using include. 

// Example of validating and sanitizing file path before using include
$included_file = $_GET['file'];
$allowed_files = ['file1.php', 'file2.php', 'file3.php'];

if (in_array($included_file, $allowed_files)) {
    include($included_file);
} else {
    echo "Invalid file included.";
}

Keywords

include PHP security performance maintenance

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