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PHP realpath_cache_size() function (with example)

Hi everyone,

I have been working with PHP recently and came across the `realpath_cache_size()` function. I'm not quite sure what exactly it does and how it can be useful in my code. Can someone please explain it to me?

I would also appreciate it if you could provide a practical example to help me understand its usage better. Thank you in advance for your assistance.

All Replies


Hey there,

I've actually used `realpath_cache_size()` in one of my projects, so I can shed some light on its usage. This function returns the size of the realpath cache in bytes. The realpath cache is used by PHP to store the resolved absolute file path of a given file, so that it doesn't have to be calculated again for subsequent calls.

By default, the realpath cache size is 16K (i.e., 16 * 1024 bytes), but you can adjust this value based on your specific requirements using `realpath_cache_size()`. Increasing the size can improve performance if your application frequently resolves the absolute paths of files.

For example, let's say you have a web application that requires resolving the absolute paths of several files repeatedly. Every time you resolve a path, PHP checks if it's already present in the realpath cache. If it is, it doesn't have to calculate the absolute path again, saving time and system resources. In this case, you might want to increase the size of the realpath cache to accommodate more paths and reduce the number of cache evictions.

To set the realpath cache size, you can use the `realpath_cache_size()` function, passing the desired size in bytes as an argument. For instance, to set the cache size to 32K, you would use:

realpath_cache_size(32 * 1024);

Keep in mind that increasing the size of the realpath cache will consume more memory, so it's essential to strike a balance between cache size and available system resources.

I hope this explanation and example help you understand how `realpath_cache_size()` works. Let me know if you have any further questions!


Hey everyone,

I noticed the discussion about `realpath_cache_size()` and thought I'd chime in with my own experience. This function has been quite useful for me in a recent web development project, so I thought I could share some insights.

In simple terms, `realpath_cache_size()` returns the size of the realpath cache in bytes. This cache is employed by PHP to store the resolved absolute file paths, allowing for quicker path resolution in future requests.

Why might this matter? Well, consider a scenario where you have a content management system that handles a large number of files and directories. Each time you access or manipulate a file, PHP needs to resolve its absolute path. Without caching, this can become a performance bottleneck, particularly if the same file is accessed multiple times within a short period.

Here's where `realpath_cache_size()` shines. By increasing the cache size, you can store a larger number of resolved file paths, minimizing the need for repetitive calculations. This leads to improved response times, reduced disk I/O, and ultimately, a smoother user experience.

To implement this in your code, you can use `realpath_cache_size()` to set the desired cache size in bytes. For instance, if you want to allocate 128K to the cache, you can do:

realpath_cache_size(128 * 1024);

Of course, it's important to strike a balance. You don't want to allocate too much memory to the cache, as it can compete with other critical components of your application. Monitoring and optimizing the cache size based on your specific requirements and available system resources is essential.

So, in summary, `realpath_cache_size()` is a nifty function that can significantly improve the performance of your PHP applications, especially when dealing with frequent file path resolutions. Give it a try and see the difference it can make!

Feel free to ask if you have any further questions or need more assistance. Happy coding!


Hey folks,

I've also encountered `realpath_cache_size()` in my PHP development journey, and I thought I'd share my insights. This function is quite handy when you're dealing with a large-scale application that involves frequent file path resolutions.

The `realpath_cache_size()` function returns the size of the realpath cache in bytes, which is essentially a cache used by PHP to store the resolved absolute paths of files. By caching these paths, PHP avoids the need to calculate them repeatedly, thus optimizing performance.

Now, let me give you an example to illustrate its practical usage. Imagine you're working on an e-commerce website where you often need to reference various product images stored across different directories. Since resolving file paths can be resource-intensive, you can take advantage of the realpath cache to speed up the process.

By increasing the size of the realpath cache using `realpath_cache_size()`, you allow PHP to store a greater number of resolved paths in memory. This means that subsequent path resolutions can be retrieved directly from the cache, minimizing the need for disk I/O operations and boosting the overall responsiveness of your application.

To set the size of the realpath cache, you can call `realpath_cache_size()` with the desired cache size specified in bytes before your application starts. For instance, if you wish to allocate 64K to the cache, you would use:

realpath_cache_size(64 * 1024);

It's worth noting that while increasing the cache size can lead to performance improvements, it's essential to strike a balance. Setting an excessively large cache might consume excessive memory resources, so it's crucial to monitor and optimize the cache size according to your application's needs and available system resources.

I hope this explanation and example provide a clearer understanding of how `realpath_cache_size()` can be beneficial for your PHP projects. If you have any further questions or need additional assistance, feel free to ask!

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