Php/docs/intro.apcu
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APCu is APC stripped of opcode caching.
The first APCu codebase was versioned 4.0.0, it was forked from the head of the APC master branch at the time.
PHP 7 support is available as of APCu 5.0.0.
APCu can provide a compatibility mode, such that it can provide a drop in replacement for the applicable parts of APC.