What are the potential performance issues of continuously running PHP scripts for real-time updates on a webpage?

Continuous running PHP scripts for real-time updates on a webpage can potentially lead to performance issues such as high server load, increased memory usage, and slower response times. To mitigate these issues, it's advisable to use techniques like caching, optimizing database queries, and implementing proper error handling to prevent script failures. 

// Example of implementing caching in PHP to improve performance
$cacheKey = 'real_time_updates_data';
$cacheTime = 60; // Cache data for 60 seconds

// Check if data is already cached
if ($data = apc_fetch($cacheKey)) {
    // Use cached data
    echo $data;
} else {
    // Fetch and process new data
    $data = fetchDataFromDatabase();

    // Cache the data
    apc_store($cacheKey, $data, $cacheTime);

    // Display the data
    echo $data;
}

// Function to fetch data from database
function fetchDataFromDatabase() {
    // Database query to fetch data
    $data = 'Real-time data fetched from database';

    return $data;
}

Keywords

PHP real-time updates performance webpage scripts

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