这个错误会是什么？

I have upgraded PHP from 5.4 to 5.6 on one of our local servers, and now I have a php file, which when I try to open from the browser, it only results in a blank white screen.

The error reporting in php.ini is set to on, and I've also told at the beginning of the file to report all errors, yet the output is still blank. When I checked the error_log, it is empty. If I delete the whole content of the .php file, and replace it with a simple echo, everything works perfectly.

How could I debug this error?

Problem : Your error_reporting function may be off in your php.ini file.

Solution : Sometimes by default in php.ini the display error function is off or allowed to show limited errors.

DISPLAY ERROR'S IN YOUR PHP FILE :

So to enable displaying errors in your php file,You will need to add one of the following statements at the begining of your php file just right after your <?php starting tag.

Note : By using any one of these statements,your php file will show every possible error.!

ini_set('display_startup_errors', 1);
ini_set('display_errors', 1);
error_reporting(-1);

Reference Links :

• http://php.net/manual/en/errorfunc.configuration.php#ini.display-errors

• http://php.net/manual/en/errorfunc.configuration.php#ini.display-startup-errors

• http://php.net/manual/en/function.error-reporting.php

@Credit Goes To @brslv