What are common mistakes beginners make when using PHP to include external files?

Common mistakes beginners make when including external files in PHP include using incorrect file paths or not properly sanitizing user input before including files. To avoid these issues, always use absolute paths when including files and validate user input to prevent directory traversal attacks. 

// Example of including an external file with proper validation
$filename = 'path/to/external/file.php';

if (file_exists($filename)) {
    include $filename;
} else {
    echo 'File not found.';
}

Keywords

include require file path syntax error undefined function

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