[stable21] Fix some php 8 warnings#27415

Merged

juliusknorr merged 3 commits intostable21from

backport/26494/stable21

Jun 14, 2021

Commits on Jun 7, 2021

Fix functions taking optional parameters before required ones

rigrig
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backportbot[bot]
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Fix a usort comparison function returning a boolean instead of an integer

rigrig
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backportbot[bot]
committed
Check whether output buffering is active before turning it off

rigrig
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backportbot[bot]
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