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[2001-02-27 15:39 UTC] derick@php.net
[2001-02-27 15:49 UTC] danielc at analysisandsolutions dot com
[2001-04-28 14:33 UTC] jmoore@php.net
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Last updated: Fri Apr 19 23:01:28 2024 UTC |
<?php # Hi: # # Running PHP 4.0.5-dev Feb 20 2001 # Windows NT 4.0 SP 6a # Apache 1.3.6 # MySQL 3.23.32 # # The problem does not exist in 4.0.4-dev Nov 23 2000. # # Problem arises when doing an isset() on a # a multidimensional array inside a function # that has that variable as an optional argument # but the argument hasn't been set, so it # defaults to ''. # # But, it's not that simple. Problem comes # and goes depending on how much memory is # being used. # # Also, situation is only happening when # using results from mysql_field_name(). # # In addition, sometimes the page gets # created by PHP and sent to the browser, # but PHP crashes anyway. # # I've already spent six hours trying to # pinpoint what's going on, though haven't # been able to hit the nail on the head yet. # # Good luck. # # --Dan class Test { var $H = 'localhost'; var $U = 'track'; var $P = 'flight9'; var $D = 'SessionTracker'; function Setup() { $this->C = @mysql_connect("$this->H", "$this->U", "$this->P"); $this->Hand = @mysql_select_db("$this->D", $this->C); $this->Res = @mysql_query("$this->Query",$this->C); $this->Cols = @mysql_num_fields($this->Res); } function FieldName($FileName,$FileLine,$ColNum) { if ( $Output = @mysql_field_name($this->Res, $ColNum) ) { return $Output; } else { echo "Field Name Had Problem"; } } # BEGIN ALTERNATIVE TEST FUNCTIONS HERE... # Uses MySQL data, but doesn't have the "$Col" argument. function Good() { for ($Count = 0; $Count < $this->Cols; $Count++) { $FieldNames[] = $this->FieldName('test','here', $Count); if ( !isset($Col[$FieldNames[$Count]]['hide']) ) { $VisibleFields++; echo "$Count = $FieldNames[$Count]. "; } } } # Doesn't use MySQL data, but uses "$Col" argument. function NoProblem($Col='') { for ($Count = 0; $Count < 3; $Count++) { $FieldNames[] = 'dog'; $FieldNames[] = 'somename'; $FieldNames[] = 'cat'; if ( !isset($Col[$FieldNames[$Count]]['hide']) ) { $VisibleFields++; echo "$Count = $FieldNames[$Count]. "; } } } # This is the function which causes the problems. # Uses MySQL data and has a "$Col" argument. function Bad($Col='') { for ($Count = 0; $Count < $this->Cols; $Count++) { ############################# # "Field Name Call -- Short" # $FieldNames[] = $this->FieldName('test','here', $Count); ############################# # "Field Name Call -- Long" # # $FieldNames[] = $this->FieldName("FieldName() had error when RSATbl() was called by $FileName","$FileLine", $Count); # PROBLEM HAPPENS ON NEXT LINE # Commenting it and the closing } gets the # problems to stop. if ( !isset($Col[$FieldNames[$Count]]['hide']) ) { # Commenting out the following line # completely shifts the pattern of what # is okay, crashes and infinite loops! $VisibleFields++; echo "$Count = $FieldNames[$Count]. "; } }# End of for $Count }# End of Bad() }# End of class $SQL = new Test; # TEST SCENARIOS FOR RUNNING THE BAD() FUNCTION # WHEN: ----------------------------------- # "Field Name Call -- Short" # "$VisibleFields++;" is open # # Okay if 1 or 2 Columns: # $SQL->Query = "SELECT concat('hi') as H"; # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B"; # Infinite Loop if 3 Columns: # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W"; # Crashes if 4 Columns: $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W, concat('oh') as O"; # WHEN: ----------------------------------- # "Field Name Call -- Long" # "$VisibleFields++;" is open # # Okay if 1 Column: # $SQL->Query = "SELECT concat('hi') as H"; # Infinite Loop if 2 Columns: # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B"; # Crash if 3 or more Columns: # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W"; # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W, concat('oh') as O"; # WHEN: ----------------------------------- # "Field Name Call -- Long" # "$VisibleFields++;" is commented out # # Okay if 1 Column: # $SQL->Query = "SELECT concat('hi') as H"; # Infinite Loop if 2 or 3 Columns: # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B"; # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W"; # Crashes if 4 Columns: # $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W, concat('oh') as O"; # NOTE: When "Infinite Loop" happens, PHP keeps # going and going. Trying to "End Process" in # Task Manager won't kill it. Only way to stop it # is to reboot. # # This situation has hindered my ability to completely # debug the problem due to the time involved with # shutting down and rebooting. # # SUGGESTION: Make PHP killable via Task Manager. # Establish the MySQL connection and execute the query. $SQL->Setup(); # Call the problematic function. $SQL->Bad(); # Call the plagued function, but set the argument. # $Arg['H']['hide'] = 'N'; # $SQL->Bad($Arg); # Call the safe functions. # $SQL->Good(); # $SQL->NoProblem(); /* DR WATSON REPORT WHEN: "Field Name Call -- Short" "$VisibleFields++;" is open Query String: $SQL->Query = "SELECT concat('hi') as H, concat('bye') as B, concat('why') as W, concat('oh') as O"; Application exception occurred: App: (pid=228) When: 2/27/2001 @ 15:15:2.88 Exception number: c0000005 (access violation) *----> System Information <----* Computer Name: BASE User Name: SYSTEM Number of Processors: 1 Processor Type: x86 Family 6 Model 3 Stepping 4 Windows Version: 4.0 Current Build: 1381 Service Pack: 6 Current Type: Uniprocessor Free Registered Organization: Analysis and Solutions Company Registered Owner: Daniel Convissor *----> Task List <----* 0 Idle.exe 2 System.exe 24 SMSS.exe 32 CSRSS.exe 38 WINLOGON.exe 46 SERVICES.exe 49 LSASS.exe 75 SPOOLSS.exe 92 Apache.exe 79 Apache.exe 90 ubsched.exe 100 mysqld.exe 154 NPSSVC.exe 160 RPCSS.exe 166 TAPISRV.exe 175 RASMAN.exe 178 mstask.exe 186 PSTORES.exe 73 NDDEAGNT.exe 211 EXPLORER.exe 220 directcd.exe 222 hpcron.exe 213 LOADWC.exe 218 PGPtray.exe 70 NOTEPAD.exe 86 netscape.exe 228 php.exe 239 DRWTSN32.exe 0 _Total.exe (00400000 - 00400000) (77f60000 - 77fbe000) dll\ntdll.dbg (10000000 - 10000000) (77f00000 - 77f5e000) dll\kernel32.dbg (77e70000 - 77ec5000) dll\user32.dbg (77ed0000 - 77efc000) dll\gdi32.dbg (77dc0000 - 77dff000) dll\advapi32.dbg (77e10000 - 77e67000) dll\rpcrt4.dbg (776d0000 - 776d8000) dll\wsock32.dbg (776b0000 - 776c4000) dll\ws2_32.dbg (78000000 - 78040000) (776a0000 - 776a7000) dll\ws2help.dbg (77b20000 - 77bd7000) dll\ole32.dbg (65340000 - 653d2000) oleaut32.dbg (6a980000 - 6a9b4000) odbc32.dbg (71700000 - 7178a000) COMCTL32.dbg (77c40000 - 77d7c000) dll\shell32.dbg (77d80000 - 77db2000) dll\comdlg32.dbg (77a90000 - 77a9b000) dll\version.dbg (779c0000 - 779c8000) dll\lz32.dbg (780a0000 - 780b2000) (04a00000 - 04a13000) ..\RES\US\ODBCLAN\\ndebug32\ODBCINT.dll (74ff0000 - 74ffe000) dll\rnr20.dbg (77bf0000 - 77bf7000) dll\rpcltc1.dbg (75360000 - 75367000) dll\rasadhlp.dbg (77660000 - 7766f000) dll\msafd.dbg (77690000 - 77699000) dll\wshtcpip.dbg State Dump for Thread Id 0xee eax=74736574 ebx=007b6d70 ecx=007f0d20 edx=007f0d20 esi=74736574 edi=007b99a4 eip=10089327 esp=0012fe8c ebp=00000004 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000206 function: <nosymbols> 10089309 6a00 push 0x0 1008930b 50 push eax 1008930c e85f470000 call 1008da70 10089311 8bd8 mov ebx,eax 10089313 83c408 add esp,0x8 10089316 bd04000000 mov ebp,0x4 1008931b 8dbb342c0000 lea edi,[ebx+0x2c34] ds:007b99a4=007f0690 10089321 8b07 mov eax,[edi] ds:007b99a4=007f0690 10089323 85c0 test eax,eax 10089325 7411 jz 10089338 FAULT ->10089327 8b30 mov esi,[eax] ds:74736574=???????? 10089329 50 push eax 1008932a e891fbffff call 10088ec0 1008932f 83c404 add esp,0x4 10089332 8bc6 mov eax,esi 10089334 85f6 test esi,esi 10089336 75ef jnz 10089327 10089338 c70700000000 mov dword ptr [edi],0x0 ds:007b99a4=007f0690 1008933e 83c704 add edi,0x4 10089341 4d dec ebp 10089342 75dd jnz 10089321 10089344 8b03 mov eax,[ebx] ds:007b6d70=007f3520 *----> Stack Back Trace <----* FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name 00000004 00000000 00000000 00000000 00000000 00000000 <nosymbols> *----> Raw Stack Dump <----* 0012fe8c 24 20 02 78 e4 15 7c 00 - bc fe 12 00 01 00 00 00 $ .x..|......... 0012fe9c f5 26 00 10 00 00 00 00 - 00 00 00 00 a0 02 7c 00 .&............|. 0012feac 10 1a 7c 00 a0 02 7c 00 - b0 35 7c 00 b0 14 7c 00 ..|...|..5|...|. 0012febc 4c ff 12 00 4f 1b 40 00 - 00 00 00 00 00 00 00 00 L...O.@......... 0012fecc 00 00 00 00 00 f0 fd 7f - 00 00 00 00 00 00 00 00 ................ 0012fedc 04 00 00 00 00 00 00 00 - 00 00 00 00 8c cc 00 78 ...............x 0012feec 50 33 13 00 f0 b3 03 78 - 00 f0 fd 7f 10 05 7c 00 P3.....x......|. 0012fefc 34 ff 12 00 03 6f f6 77 - 10 ed 7c 00 00 00 00 00 4....o.w..|..... 0012ff0c 40 0d 7f 00 00 ff ff ff - 00 00 00 00 01 00 00 00 @............... 0012ff1c 00 00 00 00 01 00 00 00 - 10 05 7c 00 00 f0 fd 7f ..........|..... 0012ff2c 00 00 00 00 a0 02 7c 00 - b0 14 7c 00 b0 35 7c 00 ......|...|..5|. 0012ff3c 01 00 00 00 00 00 00 00 - 00 00 00 00 10 1a 7c 00 ..............|. 0012ff4c c0 ff 12 00 cb 20 40 00 - 01 00 00 00 10 05 7c 00 ..... @.......|. 0012ff5c d0 0e 7c 00 00 40 40 00 - 04 40 40 00 a4 ff 12 00 ..|..@@..@@..... 0012ff6c 94 ff 12 00 a0 ff 12 00 - 00 00 00 00 98 ff 12 00 ................ 0012ff7c 08 40 40 00 0c 40 40 00 - 00 00 00 00 00 00 00 00 .@@..@@......... 0012ff8c 00 f0 fd 7f 05 00 00 c0 - 10 05 7c 00 00 00 00 00 ..........|..... 0012ff9c 45 c2 11 80 d0 0e 7c 00 - 01 00 00 00 84 ff 12 00 E.....|......... 0012ffac d4 fc 12 00 e0 ff 12 00 - 20 21 40 00 50 31 40 00 ........ !@.P1@. 0012ffbc 00 00 00 00 f0 ff 12 00 - ea b9 f1 77 00 00 00 00 ...........w.... State Dump for Thread Id 0xeb eax=00007530 ebx=00000000 ecx=000000ee edx=00000000 esi=77e726e5 edi=00fdff6c eip=77e72397 esp=00fdff24 ebp=00fdff48 iopl=0 nv up ei pl zr na po nc cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000246 function: InvalidateRect 77e7237e b89e110000 mov eax,0x119e 77e72383 8d542404 lea edx,[esp+0x4] ss:0200e92b=???????? 77e72387 cd2e int 2e 77e72389 c20c00 ret 0xc 77e7238c b885110000 mov eax,0x1185 77e72391 8d542404 lea edx,[esp+0x4] ss:0200e92b=???????? 77e72395 cd2e int 2e 77e72397 c21400 ret 0x14 *----> Stack Back Trace <----* FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name 00fdff48 10093425 00fdff6c 00000000 00000000 00000000 user32!InvalidateRect */ ?>