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What kind of performance implications are there to consider when using try-catch statements in php 5?
I've read some old and seemingly conflicting information on this subject on the web before. A lot of the framework I currently have to work with was created on php 4 and lacks many of the niceties of php 5. So, I don't have much experience myself in using try-catchs with php.
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In general, wrapping your Java code with try/catch blocks doesn't have a significant performance impact on your applications. Only when exceptions actually occur is there a negative performance impact, which is due to the lookup the JVM must perform to locate the proper handler for the exception.
The primary method of handling exceptions in PHP is the try-catch. In a nutshell, the try-catch is a code block that can be used to deal with thrown exceptions without interrupting program execution. In other words, you can "try" to execute a block of code, and "catch" any PHP exceptions that are thrown.
If you've one if/else block instead of one try/catch block, and if an exceptions throws in the try/catch block, then the if/else block is faster (if/else block: around 0.0012 milliseconds, try/catch block: around 0.6664 milliseconds). If no exception is thrown with a try/catch block, then a try/catch block is faster.
Does try { } catch make program slower? No. There's a performance hit to actually throwing an exception, but if you don't catch it, it'll just propagate up and potentially be unhandled. In the case of exceptions you have no control over such as the standard or third …
One thing to consider is that the cost of a try block where no exception is thrown is a different question from the cost of actually throwing and catching an exception.
If exceptions are only thrown in failure cases, you almost certainly don't care about performance, since you won't fail very many times per execution of your program. If you're failing in a tight loop (a.k.a: banging your head against a brick wall), your application likely has worse problems than being slow. So don't worry about the cost of throwing an exception unless you're somehow forced to use them for regular control flow.
Someone posted an answer talking about profiling code which throws an exception. I've never tested it myself, but I confidently predict that this will show a much bigger performance hit than just going in and out of a try block without throwing anything.
Another thing to consider is that where you nest calls a lot of levels deep, it can even be faster to have a single try...catch right at the top than it is to check return values and propagate errors on every call.
In the opposite of that situation, where you find that you're wrapping every call in its own try...catch block, your code will be slower. And uglier.
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