Sergey Biryukov 0b63252b2d Media: In wp_unique_filename(), use explicit type casting when incrementing $number.
This prevents the "non-numeric value encountered" warning in PHP 7.1, caused by trying to increment an empty string on the first loop iteration.

Props drrobotnik for initial patch.
Fixes #39774.



git-svn-id: https://develop.svn.wordpress.org/trunk@40039 602fd350-edb4-49c9-b593-d223f7449a82
2017-02-03 20:57:38 +00:00
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