Tag: Web
PHP arrays are sort of a combination of traditional C-style arrays (i.e., index-based lookup) and hash tables (plus a few extra bits). With this comes a decent amount of overhead — they use a lot of memory! For something as basic as an array of 64-bit integers, it uses around 152 bytes per entry: Memory usage in MB for an…
PHP is largely a stateless language. With few exceptions, its environment is completely constructed from scratch for each request. Consequently, maintaining a semblance of state persistence requires a storage backend so each iteration of the environment can be initialized accordingly. Retrieving from storage is a more expensive operation than storing in active memory, so a naive approach to rate limiting…
PHP is a language that has largely had its development driven by the real world use and demands by its users. Those users, unfortunately, have not always updated in a timely fashion, so functionality that has been implemented over multiple versions is not always fully available and can create problems for the unaware. The zlib family of functions are one…
I had a debugging problem recently with some server code. It involved passing a list of IP addresses and associated metadata to the central server so that list could be pulled into a different host later. The problem was that, as soon as it reached 127 IPs, everything after that was ignored. Searching for a hint on why produced very…
The purpose of this post is to serve as something of a catch-all how-to for hosting multiple domains with Apache 2 on a single IP with SSL enabled for all of them. I recently underwent this process with every domain I have a website behind, and doing it correctly required information from a lot of different sources. SNI Hosting multiple…