![]() ![]() The PHP error reporting mechanism is vital in developing applications. They could also be turned into full-blown exceptions, which in turn can be handled by other error handling mechanisms. For example, their output can be turned off entirely or they can be redirected into a log file. How these errors are handled can be customized. These errors can have different types, ranging from a relatively harmless E_NOTICE to a program-halting fatal E_ERROR. PHP is choosing the middle ground: it triggers an error, which by default simply causes a message to be output wherever it occurred. There is now the dilemma between letting programs crash completely for every little mistake, or silently letting non-critical errors slip through. Since there is no separate compilation step, certain types of errors that could be caught by a compiler can only surface at runtime. The PHP interpreter and runtime can only complain about errors while the code is in full motion. ![]() PHP code is simply executed straight from the source and it either works or dies halfway through. 1 That is, you don't typically compile PHP source code into an executable, then run that executable. PHP is an interpreted language that lacks a compilation step separate from the actual runtime. To explain what these functions are needed for to begin with, it's necessary to talk about PHP's error reporting mechanism. This article attempts to fill that gap and takes a broad sweep of related topics to do so. The PHP manual itself doesn't have a simple explanation that actually captures their essence and most posts written around the web seem to be missing some detail or other as well. PHP has two very similar functions that are essential to writing good PHP applications, but whose purpose and exact function is rarely well explained: isset and empty. The Definitive Guide To PHP's isset And empty ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |