Are there any potential limitations or pitfalls in relying solely on PHP for web development?

One potential limitation of relying solely on PHP for web development is that PHP is not as fast as other languages like Node.js or Java. This could lead to slower performance for high-traffic websites. To mitigate this issue, developers can use caching techniques, optimize their code, and utilize PHP frameworks like Laravel or Symfony which can help improve performance. 

// Example of using caching in PHP to improve performance
// Check if the data is already cached
if (apcu_exists('cached_data')) {
    $data = apcu_fetch('cached_data');
} else {
    // If data is not cached, fetch it from the database
    $data = fetchDataFromDatabase();

    // Cache the data for future use
    apcu_store('cached_data', $data, 3600); // Cache data for 1 hour
}

// Use the data for further processing
processData($data);

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