Description:
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When fopen is used without the second parameter, php segfaults in apache 2.2. I had this happen two times, once when I was using bcompiler and once when I was using xml_parser. I thought that the issue was the other modules until I realized that I was missing the second parameter to fopen. 

I was doing a test on the returned value to check for validity such as if ( $fh ) or if ( is_resource ( $fh ) ) and was unable to see any warnings.

Once I removed the test and any interior blocks to the filehandle test from the code, I was able to see a warning. I fixed the issue and have been working solid since. 

Reproduce code:
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$regionf = 'regions.xml' ;
$fregions = fopen ( $regionf ) ;
if ( $fregions ){
    echo "File Opened" ;
    $xmldoc = fread ( $fregions, filesize ( $regionf ) ) ;
    $parser = xml_parser_create  ( ) ;
    if ( $parser ){
	xml_parser_set_option($parser,XML_OPTION_TARGET_ENCODING, "UTF-8");
       xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,1); 
       xml_parse ( $parser, $doc ) ;
       xml_parse_into_struct($parser, trim($xmldoc), $xml_values);
       print_r ( $xml_values ) ;
       xml_parser_free ( $parser ) ;
    }
    fclose ( $fregions ) ;
}

Expected result:
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apache segfault -  browser displays previous content ( cache )