Znak @ przed wywołaniem funkcji

138

Jaka jest różnica między tymi dwoma wywołaniami funkcji w PHP?

init_get($somevariable);

@init_get($somevariable);

php

— nixie
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the "@" will close any php errors and notices

— Erkan Özkök

214

the "@" will silence any php errors your function could raise.

— solidgumby
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But what if you put @ in front of PHP's trigger_error function? I have seen that in some code, but its behavior is inconsistent for me so far. In some cases, I do see the error being reported by the configured error handler and in other cases it does seem to get reported.

— fritzmg

2

The @ will temporarily set error_reporting to 0 but will not "suppress" the error.

— solidgumby

49

It silences errors and warnings. See Error Control Operators.

— Sampson
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37

As already answered the @ will stop the error (if any) from showing up.
In terms of performance this is not recommended.

What php is doing is:

reading the error display state
setting the error display to show no errors
running your function
setting the error display to it's previous state

If you don't want any errors showing up use error_reporting(0);.

Or just write bug free code :P

— AntonioCS
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Prefer to put zero, but if that works, great didn't know about it :)

— AntonioCS

1

What about functions that you do not control, like mail for example? Which other options exist? I am using @ right now, but would be great to be able to do in different way

— spuas

8

http://www.faqts.com/knowledge_base/view.phtml/aid/18068/fid/38

All PHP expressions can be called with the "@" prefix, which turns off error reporting for that particular expression.

— George
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6

As everyone said, it stops the output of errors for that particular function. However, this decreases performance greatly since it has to change the error display setting twice. I would recommend NOT ignoring warnings or errors and fixing the code instead.

— Daniel Sorichetti
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Thanks to all for your answers. That code is not mine, I was only looking at the phpBB code for curiosity, so I have no problems of performance. :) Thanks again.

— nixie