Is it advisable to cache entire web pages instead of individual function calls in PHP for performance optimization?

Caching entire web pages can be beneficial for performance optimization as it reduces the processing time required to generate the page on subsequent requests. However, caching individual function calls can be more efficient in some cases, especially if the page contains dynamic content that needs to be updated frequently. It is important to consider the specific requirements of your application and the trade-offs between caching entire pages versus individual function calls. 

// Example of caching individual function calls in PHP

function expensiveFunction() {
    // Simulating a time-consuming task
    sleep(2);
    return "This is the result of the expensive function";
}

// Check if the result is already cached
if(!($cachedResult = apc_fetch('cached_result'))) {
    // If not cached, call the expensive function and cache the result
    $result = expensiveFunction();
    apc_store('cached_result', $result, 60); // Cache for 60 seconds
    echo $result;
} else {
    // If cached, retrieve and output the result
    echo $cachedResult;
}

Keywords

caching web pages function calls performance optimization PHP

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