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If you would like to test whether the includes happened successfully, you can test the return value of the include function itself:
// http://us3.php.net/manual/en/function.include.php Example #4
if ((include file1.php ) != OK ) {
die();
}
You may also consider require() instead of include() depending on your needs:
require() is identical to include() except upon failure it will also produce a fatal E_ERROR level error. In other words, it will halt the script whereas include() only emits a warning (E_WARNING) which allows the script to continue.