Recursive PHP method crashes Apache

I call my method Assembler::PrefetchComponents with an array of valid
components and it crashes only when I include the line
"self::PrefetchComponents($dependencies);" Please help me solve the
error in this code.

Here's Assembler::PrefetchComponents:

public static function PrefetchComponents($names)
{
$failed = array();

if(sizeof($m_arrComponents) > 0)
{
$names = array_filter($names,create_function('$var',
'return(Assembler::GetComponentByName
($var))==NULL;'));
}

$dependencies = array();

foreach($names as $name)
{
if(self::TryIncludingComponent($name))
{
$dependencies = array_merge($dependencies,
call_user_func(array("Component_$name",
"Dependencies")));
}
else
{
$failed[] = $name;
}
}

if(sizeof($failed)!=0)
{
sort($failed);
Error::ThrowError(CBD_NO_COMPONENT, $failed);
}

self::PrefetchComponents($dependencies);
}

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Re: Recursive PHP method crashes Apache

> I call my method Assembler::PrefetchComponents with an array of valid
> components and it crashes only when I include the line
> "self::PrefetchComponents($dependencies);" Please help me solve the
> error in this code.

Most probably you are getting infinite (or very very very deep)
recursion loop in this code, which in PHP would lead to a crash.

--
Stanislav Malyshev, Zend Software Architect
stas@zend.com http://www.zend.com/
(408)253-8829 MSN: stas@zend.com

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Re: Recursive PHP method crashes Apache

Aaron Schiff wrote:
> I call my method Assembler::PrefetchComponents with an array of valid
> components and it crashes only when I include the line
> "self::PrefetchComponents($dependencies);" Please help me solve the
> error in this code.

The code below is an infinite loop. Unless there is an error (assuming
Error::ThrowError halts execution), at no point does it return and at
the end of the function it calls itself. This will never end. Apache
crashes because it fills up the stack.

> Here's Assembler::PrefetchComponents:
>
> public static function PrefetchComponents($names)
> {
> $failed = array();
>
> if(sizeof($m_arrComponents) > 0)
> {
> $names = array_filter($names,create_function('$var',
> 'return(Assembler::GetComponentByName
> ($var))==NULL;'));
> }
>
> $dependencies = array();
>
> foreach($names as $name)
> {
> if(self::TryIncludingComponent($name))
> {
> $dependencies = array_merge($dependencies,
> call_user_func(array("Component_$name",
> "Dependencies")));
> }
> else
> {
> $failed[] = $name;
> }
> }
>
> if(sizeof($failed)!=0)
> {
> sort($failed);
> Error::ThrowError(CBD_NO_COMPONENT, $failed);
> }
>
> self::PrefetchComponents($dependencies);
> }

I'm thinking that last line should be...

if (count($dependencies) > 0)
{
self::PrefetchComponents($dependencies);
}

-Stut

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http://stut.net/

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Issues trying to connect to DB2 via PHP

I'm using IIS on a windows server. I'm having issues trying to connect
to DB2 via PHP.



I can connect to DB2 on the command line on the server.

> db2cmd db2 "connect to emr1u1 user etldbu using xxxx"

Database Connection Information

Database server =3D DB2/AIX64 9.1.3
SQL authorization ID =3D ETLDBU
Local database alias =3D EMR1U1



When I connect to the same DB in PHP as cataloged or uncataloged, I get
this:

Connection to database failed.
SQLSTATE:=20
Message:=20




Below are my PHPINFO settings and the cataloged and uncataloged PHP
scripts.



***************
*** PHPINFO ***
***************

*** ibm_db2***

IBM DB2, Cloudscape and Apache Derby support =3D enabled
Module release =3D 1.6.3
Module revision =3D 1.71
Binary data mode (ibm_db2.binmode) =3D DB2_BINARY =20


*** Environment ***

CLASSPATH =3D .;
C:\PROGRA~1\IBM\SQLLIB\java\db2java.zip;
C:\PROGRA~1\IBM\SQLLIB\java\db2jcc.jar;
C:\PROGRA~1\IBM\SQLLIB\java\db2jcc_license_cu.jar;
C:\PROGRA~1\IBM\SQLLIB\bin;
C:\PROGRA~1\IBM\SQLLIB\java\common.jar =20

DB2INSTANCE =3D DB2
DB2TEMPDIR =3D C:\PROGRA~1\IBM\SQLLIB\ =20

Path =3D F:\PHP\;F:\cygwin\bin;C:\Program Files\EMC\PowerPath\;
C:\Program Files\Windows Resource Kits\Tools\;C:\Program Files\Support
Tools\;
C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\PROGRA~ 1\IBM\SQLLIB
\BIN;
C:\PROGRA~1\IBM\SQLLIB\FUNCTION;C:\PROGRA~1\IBM\SQLLIB\SAMPL ES\REPL;
C:\Program Files\PGP Corporation\PGP Command Line\;F:\AbInitio\bin =20


*****************
*** CATALOGED ***
*****************

<=3Fphp

$database =3D 'emr1u1';
$user =3D 'etldbu';
$password =3D 'xxxx';

print 'Timestamp: '. date('H:i:s, F j, Y') ."

";

$conn =3D db2_connect($database, $user, $password);

if ($conn) {
echo "Connection succeeded.";
db2_close($conn);
}
else {
echo "Connection failed.

";
echo 'SQLSTATE: ' . db2_conn_error() . '
';
echo 'Message: ' . db2_conn_errormsg(). '
';
}
=3F>


*******************
*** UNCATALOGED ***
*******************

<=3Fphp

$database =3D 'emr1u1';
$user =3D 'etldbu';
$password =3D 'xxxx';
$hostname =3D 'imdsdev01';
$port =3D 42016;

print 'Timestamp: '. date('H:i:s, F j, Y') ."

";

$conn_string =3D "DRIVER=3D{IBM DB2 ODBC DRIVER};DATABASE=3D$database;" .
=20
"HOSTNAME=3D$hostname;PORT=3D$port;PROTOCOL=3DTCPIP;UID=3D$u ser;PWD=3D$pass=
word;";
$conn =3D db2_connect($conn_string, '', '');

if ($conn) {
echo "Connection succeeded.";
db2_close($conn);
}
else {
echo "Connection failed.

";
echo 'SQLSTATE: ' . db2_conn_error() . '
';
echo 'Message: ' . db2_conn_errormsg(). '
';
}
=3F>


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