What are the potential pitfalls of replacing MySQL with a text file for data storage in PHP?

Potential pitfalls of replacing MySQL with a text file for data storage in PHP include limited scalability, slower data retrieval, lack of data integrity constraints, and potential security vulnerabilities. 

// Example code snippet using a text file for data storage
$file = 'data.txt';

// Writing data to the text file
$data = "John,Doe,30\n";
file_put_contents($file, $data, FILE_APPEND);

// Reading data from the text file
$contents = file_get_contents($file);
$lines = explode("\n", $contents);

foreach ($lines as $line) {
    $fields = explode(",", $line);
    // Process data as needed
}

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