php3_fopen_url_wrapper() segfaults at line 630 on an 
invalid ftp url:

<?php
if ( $fp = fopen( "ftp://localhost", "r" ) ) {
   fpassthru( $fp );
} else {
   echo "No ftp connection opened.\n";
}
?>

This segfaults instead of printing the 'not a directory'
warning; checking that resource->path exists fixes it.