Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr - Use 4-argument substr instead of writing substr($foo, 2, 6) = $bar.

This Policy is part of the core Perl::Critic distribution.

Conway discourages the use of substr() as an lvalue, instead recommending that the 4-argument version of substr() be used instead.

    substr($something, 1, 2) = $newvalue;     # not ok
    substr($something, 1, 2, $newvalue);      # ok

The four-argument form of substr() was introduced in Perl 5.005. This policy does not report violations on code which explicitly specifies an earlier version of Perl (e.g. use 5.004;).

This Policy is not configurable except for the standard options.

"substr" in perlfunc (substr in perlfunc) (or perldoc -f substr).

"4th argument to substr" in perl5005delta (4th argument to substr in perl5005delta)

Graham TerMarsch <graham@howlingfrog.com>

Copyright (c) 2005-2011 Graham TerMarsch. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.