E_ERROR is defined as 1, so it’s the same as
error_reporting(E_ERROR);
So basically it tells PHP only to report fatal errors.
As Skilldrick says, you should use named constants, as their defined values can and will change through newer versions of PHP. One well-known such example is E_ALL, which had the following values (from the same PHP manual table):
- 30719in PHP 5.3.x (currently)
- 6143in PHP 5.2.x
- 2047previously
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solved What do you think that the error_reporting(1); instruction makes? [closed]