Description:
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From manual page: https://php.net/apcuiterator.construct
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Passing in an array of PCRE regular expressions to the constructor of APCUIterator as first argument never return any result.

Test script:
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<?php 

apcu_add("Test","data");

echo (new APCUIterator("/^Test$/"))->getTotalCount();// 1
echo (new APCUIterator(["Test"]))->getTotalCount();// 1
echo (new APCUIterator(["/^Test$/"]))->getTotalCount();// 0 -> should be 1


Expected result:
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In my understanding of the documentation, we should be able to pass as first argument an array filled with regexp to find matching entries in apcu's stored keys.