On Mon, Feb 2, 2009 at 7:49 AM, Gavin Hodge <gavin.hodge@xxxxxxxxx> wrote:
> Hi,
>
> I'm fairly new to PHP, having migrated from the Java / C# world.
>
> I wrote some code similar to the following:
>
> $success = true;
> $success &= operation1();
> $success &= operation2();
>
> if ($success === true) {
> operation3(); // depends on 1 and 2 being successful
> }
>
> This didn't work as expected. After a bit of digging I found:
> * The &= operation isn't mentioned anywhere in the PHP documentation
> * The &= function seems to work as expected, however the following is
> observed...
> $success = true;
> $success &= true;
> print $success == true; // outputs 1
> print $sucesss === true; // no output
> * The 'or' assignment operator |= causes no errors but doesn't work.
>
> Can any PHP gurus explain why the &= operator works at all, and why
> === seems to fail afterwards?
>
> Cheers,
> Gavin.
>
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>
http://us.php.net/manual/en/language.operators.bitwise.php
You're doing an AND, then assigning it when you say &=. Think of it
like doing something such as .= or +=.
You might also be confusing &= with =& where =& means assign by
reference. This used to be very necessary when dealing with php4 oop,
but isn't so much anymore.
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