What are some potential issues when using the include function in PHP to include files in a website?

One potential issue when using the include function in PHP is that it can include files from external sources that may not be secure, leading to potential security vulnerabilities. To solve this issue, it is important to validate the file path before including it to ensure that only trusted files are included. 

$file = "path/to/secure/file.php";

if (strpos($file, 'secure') !== false) {
    include $file;
} else {
    echo "Invalid file path";
}

Keywords

include PHP file inclusion security vulnerability code injection

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