Answer
Traditional PHP runs synchronously. Async PHP (ReactPHP, Swoole, Amp) uses event loops to handle concurrent non-blocking I or O for real-time performance.
Quick Answer
Traditional PHP is synchronous: each line runs in order, blocking on I/O (DB queries, HTTP calls). Async PHP (via Swoole, ReactPHP, or Amp) uses event loops to handle multiple operations concurrently without blocking. Async PHP is faster for I/O-heavy tasks. Traditional PHP is simpler and sufficient for most web apps. Swoole allows true async with coroutines in PHP.
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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