Answer
Use atomic operations, file locks, DB advisory locks, Redis RedLock, and idempotent writes. Implement retry logic and conflict detection for safe distributed workflows.
Quick Answer
Race conditions in distributed PHP: two workers read same value, both update, one overwrites the other. Fix with optimistic locking (check version on update), pessimistic locking (SELECT FOR UPDATE), or atomic Redis operations (INCR, SETNX, Lua scripts). Use database transactions with proper isolation levels. For distributed locks use Redis SETNX with TTL or Redlock algorithm across Redis nodes.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ