fwrite not writing (simpler example), PHP 4.0.4pl1, Apache/1.3.14

Suggestions so far have focused on parts of the function other than fwrite, so I'm trying again with a stripped-down example. After spending many hours trying to make this very simple function work again, I'm beginning to think fwrite in broken--either in 4.0.4pl1 (?!) or in my build of it (it was working fine before...). Before filing a bug report, would a few people test whether this fails to write on their system too? Thank you! function build_file() { $fp=fopen("/path/to/directory/test.inc","w") or die("ERROR on fopen" . $php_errormsg); fwrite($fp,"<p>Hi, I'm some test content</p>",100000000) or die("ERROR: fwrite " . $php_errormsg); fclose($fp) or die("ERROR: fclose" . $php_errormsg); } build_file(); //no errors and file modification date is updated echo "<p>Begin include...<p>"; //ok include("/path/to/directory/test.inc"); //NOTHING! echo "<p>...End include<p>"; //ok (Checking from the commandline, the file is definitely being set to empty. It's writing an empty string to the file instead of writing the specified content.) -- CC