How to block php errors to be logged in codeigniter

How to block 开发者_运维问答the php errors like Severity: Notice —> Undefined variable

to be get logged in codeigniter , even by keeping the log threshold level at 3 at config settings.

this scenario occurs due to that all variables are not getting used each and every time.

thanks in advance

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error_reporting(E_ALL & ~E_WARNING & ~E_NOTICE & ~E_DEPRECATED);

This will suppress all warnings, notice and deprecated(if using php 5.3) messages.