PHP7.1 "non-numeric value encountered" warning from /core/menu/megamenu.php

[jimmisonr]

The code on line 337 of /core/menu/megamenu.php needs to be changed from
$width += $colw; to $width = $colw; (remove the +).

This code is part of a if-statement that first of all tests for !$width. The error is thrown because in PHP7.1, it seems that you can no longer do mathematical operations (addition, in this case via the +=) on a null variable. The + should not have been used in the code at all because the if-statement already has established that $width is undefined or 0.

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[jimmisonr]

... or for another solution (which I think addresses the core problem better): see sqopnil's Pull Request at https://github.com/themexpert/Expose-Framework-Library/pull/73/files

[mazharvai007]

Thank you for finding out the issue. The issue is fixed. Please upgrade the Expose framework.