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The voting phase for the PREG_THROW_ON_ERROR RFC has begun, announced by author Osama Aldemeery on the PHP internals list after a discussion period without open issues. Voting closes on 2026-09-18 at 17:00 UTC. The RFC lives at wiki.php.net/rfc/preg_throw_on_error, and the implementation is in php-src pull request 22797.

The proposal adds an opt-in PREG_THROW_ON_ERROR flag. Passing it to any preg_* matching function makes every PCRE error recorded by the call additionally throw a \PregException. The exception's code and message match preg_last_error() and preg_last_error_msg() exactly. Calls without the flag behave exactly as they do today.

Tim Düsterhus voted against the RFC while agreeing with the general concept. He objects to keeping a Warning on compilation errors: since the feature is new and opt-in, he argues there are no backwards compatibility constraints, and the requirement that $e->getMessage() equal preg_last_error_msg() weakens the feature because the exception should carry all necessary information.

He also disagrees with leaving exceptions thrown inside user callbacks unwrapped. In his view they should become a \PregException with the original exception set as $previous. Otherwise developers still need a catch(Exception) around every preg_ call, which undermines the point of a dedicated exception class. He notes this also conflicts with the PHP throwable policy, which requires extensions to wrap exceptions from external functionality and set $previous.