Version 5.1.23

• Revert use of monotonic clock for TTL (#451)
• Fix a crash when serializing packed arrays (e.g. lists) in PHP 8.2+ with apc.serializer=default.
• Reduce memory usage when serializing packed arrays (e.g. lists) in PHP 8.2+ with apc.serializer=default.
• Speed up serializing arrays with apc.serializer=default.
• Reduce memory usage when unserializing instances of the empty array in PHP 7.3+.
• Removed no longer working apcue extension.
• Increased limit on maximum number of slots.
• Made tests compatible with PHP 8.3.

Version 5.1.22

• PHP 8.2 compatibility
• PHP 8.1 compatibility in apc.php
• Fix --enable-apcu-rwlocks configure option
• Enable transparent huge pages for mmap memory
• Use monotonic clock for TTL

Version 5.1.21

• Fixed compatibility with PHP 8.1 by adding return types to APCUIterator.
• APCUIterator::current() and::key()can no longer be called on an invalid iterator.

Version 5.1.20

• Fix deadlocks when other apcu_* functions are used inside apcu_entry(). It should now be safe to use any functions inside the apcu_entry() callback.
• Fix division by zero exception in apc.php.
• Fix handling of references in PHP 8 if "default" serializer is used (which is not the default).
• Fix string reuse handling if "default" serializer is used (which is not the default).
• Check for failures when acquiring read locks to report problems earlier (write locks were already checked previously).
• Adjust tests for current PHP 8.1 development branch.
• Remove *_api.h headers. Use apc_cache.h instead of apc_cache_api.h etc.

Version 5.1.19

• Fixed apcu_store() with integer keys (#388).
• Made apc.use_request_time=0 the default (#391).
• Made apcu compatible with PHP 8.0.

Version 5.1.18

• Implement apcu_inc() and apcu_dec() using atomic operations. This means that these functions no longer have to acquire a write lock. These functions will now wraparound on overflow, instead of saturating to a floating point value.
• Make table header in apc.php sticky.
• Fix compile warnings related to mktemp() usage.
• Fix compatibility with PHP 8.0.
• Fix required number of arguments for apcu_store() returned by Reflection.

Version 5.1.17

• Fixed compatibility with PHP 7.4 and PHP 8.0.

Version 5.1.16

• Fix build on OS X.

Version 5.1.15

Bugfix release for PHP 7

• Restore apc.serializer=php as the default, as the "default" serializer still/again has issues.
• Fix possible issues in persistence of arrays with the "default" serializer.
• Attempt to reduce shared memory fragmentation.

Version 5.1.14

Bugfix release for PHP 7

• Fixed #347: Disable slam defense by default.
• Fix potential issue with destruction of locks. This does not affect Linux, but might affect Windows and BSD.
• Use mutex instead of rwlock for shared memory allocator (if pthreads mutex available).
• Require only read-lock for apcu_cas(), by using atomic compare-and-swap.