What are common mistakes when including files in PHP scripts?

Common mistakes when including files in PHP scripts include using incorrect file paths, not checking if the file exists before including it, and including the same file multiple times which can lead to errors. To avoid these issues, always use the correct file paths, check if the file exists before including it, and use include_once or require_once to prevent including the same file multiple times. 

// Correct way to include a file in PHP
$file = 'path/to/file.php';
if (file_exists($file)) {
    require_once $file;
} else {
    echo "File does not exist.";
}

Keywords

include require include_once require_once file paths

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