问题
How do I get something more meaningful than 'FALSE' when I can't open a file.
$myFile = "/home/user/testFile.txt";
$fh = fopen($myFile, 'w') or die("can't open file");
When I use the die statement, can't open file is returned to the client, and it is almost useless. If I remove it, no error is raised. If I return $fh it is FALSE. I tried both local file name and absolute file name. My index.html file is in one of the sub folders of my hole folder. Furthermore, I am using suPHP with the folder I am trying to write to having a permission of 0755 (suPHP requires this for all folders).
How do I figure out why there was a problem, or at least query it before trying to open the file.
回答1:
fopen should raise an E_WARNING if it fails. See error_get_last or set_error_handler(*) to catch it. Other than that you can use file_exists and is_readable to check whether the file is missing or there's another (probably permission-related) problem.
(*) I consider it good practice to always set an error handler that turns all PHP errors into exceptions.
回答2:
Use error_get_last() to catch the (supressed) errors in php:
$f = @fopen("x", "r") or die(print_r(error_get_last(),true));
来源：https://stackoverflow.com/questions/8018693/get-meaningful-information-when-fopen-fails-php-suphp