PHP script halts on a mysql query with no exception thrown and no entry in php error log

I have a script that produces a report. For most widgets* it produces a report with no problem. For a particular widget it exits in the middle during a mysql query and a 500 is returned to the browser. By inserting writes to the php_error log I know the exact last line to be executed and it's always the same line. It's not a timeout because other widget reports run longer (and it bombs out in about 10 seconds).

Also, I've tried running the query it's trying to run in phpadmin and it runs OK.

When this abort occurs I see nothing appear in php_error.log, nothing in apache's error log and when I surround the offending statement with a try/catch, no exception is caught.

Is there somewhere else I can look that might show what error is occurring?

* by widget I'm not referring to a UI component. 开发者_如何学运维 I'm using widget in the sense of fictional product from a fictional company

addendum ====================================================================== Since it was requested I posted the code although I think the problem isn't the code since it works in all but this once case. The problem is more likely in the data for this particular case.

error_log('['.__FILE__.']['.__LINE__."] check");

$table = new metrics_sessions();

//here I print out the SQL statement that will eventually be executed
error_log('['.__FILE__.']['.__LINE__."] check: "."guider_slug=? ".($effective_mindate!=null?" and date>'".$effective_mindate."'":"").($effective_maxdate!=null?" and date<'".$effective_maxdate." 23:59:59'":"").($effective_version!=0 && $effective_version!="all"?" and version=".$specific_version:"").($effective_campaign!==null && $effective_campaign!="all" ?" and campaign='".$effective_campaign."'":"")." order by date");

// BELOW IS THE LAST LINE I SEE IN PHP ERROR
error_log('['.__FILE__.']['.__LINE__."] check"); 

try {

    $sessions = $table->Find("guider_slug=? ".($effective_mindate!=null?" and date>'".$effective_mindate."'":"").($effective_maxdate!=null?" and date<'".$effective_maxdate." 23:59:59'":"").($effective_version!=0 && $effective_version!="all"?" and version=".$specific_version:"").($effective_campaign!==null && $effective_campaign!="all" ?" and campaign='".$effective_campaign."'":"")." order by date",array($param_gslug));

    error_log('['.__FILE__.']['.__LINE__."] check");

}catch(Exception $e){

    error_log('['.__FILE__.']['.__LINE__."] check");
    error_log('Caught exception: '.$e->getMessage());
    error_log('File: '.$e->getFile());
    error_log('Line: '.$e->getLine());
    error_log('Trace: '.$e->getTraceAsString());

}

error_log('['.__FILE__.']['.__LINE__."] session count: ".count($sessions));

Check for error supression operators (@) in your code and the code you are calling.

Try editing your error php.ini file to allow warnings and error codes to be displayed.

error_reporting = E_ALL | E_STRICT  

This would be sufficient.