2009/8/22 Szczepan Hołyszewski <webmas...@strefarytmu.pl>:
> Hello!
> I am almost certain I am hitting some kind of bug. All of a sudden, array()
> stops returning an empty array and starts returning something weird. The weird
> thing behaves as NULL in most circumstances (e.g. gettype() says NULL),
> except:
>        $foo=array();      // <-- weird thing returned
>        $foo[]="bar";
> causes "Fatal error: [] operator not supported for strings", which is 
> different
> from the regular behavior of:

Hi there,

Without seeing the actual code, it's hard to say what the problem is.
However, I'd be pretty surprised if you've actually run into a bug in
PHP--I would first suspect a bug in your code. No offense
intended--that's just how it usually plays out. :)

What it looks like to me is that something is causing $foo to be a
string before the '$foo[] = "bar";' line is encountered. What do you
get if you put a gettype($foo); just before that line?

>        $foo=null;
>        $foo[]="bar";      // <-- $foo simply becomes an array
> The problem is not limited to one place in code, and indeed before the fatal
> caused by append-assignment I get several warnings like "array_diff_key():
> Argument #1 is not an array", where the offending argument receives a result 
> of
> array().

This would appear to support my suspicion, but try inserting the
gettype($foo) (or better, var_export($foo);) just before one of the
lines which triggers the error, and post the results.

Can you post the code in a .zip file or online somewhere? If not,
that's cool, but it will probably make it harder to help you track it
down if you can't.



> The effect is not random, i.e. it always breaks identically when the same
> script processes the same data. However I was so far unable to create a
> minimal test case that triggers the bug. My script is rather involved, and
> here are some things it uses:
>  - Exceptions
>  - DOM to-fro SimpleXML
>  - lots of multi-level output buffering
> Disabling Zend Optimizer doesn't help. Disabling Zend Memory Manager is
> apparently impossible. Memory usage is below 10MB out of 128MB limit.
> Any similar experiences? Ideas what to check for? Workarounds?
> From phpinfo():
> PHP Version:
> 5.2.9 (can't easily upgrade - shared host)
> System:
> FreeBSD 7.1-RELEASE-p4 FreeBSD 7.1-RELEASE-p4 #0: Wed Apr 15 15:48:43 UTC 2009
> amd64
> Configure Command:
> './configure' '--enable-bcmath' '--enable-calendar' '--enable-dbase' 
> '--enable-
> exif' '--enable-fastcgi' '--enable-force-cgi-redirect' '--enable-ftp' '--
> enable-gd-native-ttf' '--enable-libxml' '--enable-magic-quotes' '--enable-
> maintainer-zts' '--enable-mbstring' '--enable-pdo=shared' '--enable-safe-mode'
> '--enable-soap' '--enable-sockets' '--enable-ucd-snmp-hack' '--enable-wddx'
> '--enable-zend-multibyte' '--enable-zip' '--prefix=/usr' '--with-bz2' '--with-
> curl=/opt/curlssl/' '--with-curlwrappers' '--with-freetype-dir=/usr/local' '--
> with-gd' '--with-gettext' '--with-imap=/opt/php_with_imap_client/' '--with-
> imap-ssl=/usr/local' '--with-jpeg-dir=/usr/local' '--with-libexpat-
> dir=/usr/local' '--with-libxml-dir=/opt/xml2' '--with-libxml-dir=/opt/xml2/'
> '--with-mcrypt=/opt/libmcrypt/' '--with-mhash=/opt/mhash/' '--with-mime-magic'
> '--with-mysql=/usr/local' '--with-mysql-sock=/tmp/mysql.sock' '--with-
> mysqli=/usr/local/bin/mysql_config' '--with-openssl=/usr/local' '--with-
> openssl-dir=/usr/local' '--with-pdo-mysql=shared' '--with-pdo-sqlite=shared'
> '--with-pgsql=/usr/local' '--with-pic' '--with-png-dir=/usr/local' '--with-
> pspell' '--with-snmp' '--with-sqlite=shared' '--with-tidy=/opt/tidy/' '--with-
> ttf' '--with-xmlrpc' '--with-xpm-dir=/usr/local' '--with-xsl=/opt/xslt/' '--
> with-zlib' '--with-zlib-dir=/usr'
> Thanks in advance,
> Szczepan Holyszewski
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