NVG questions

• how to test php scalability
• php mail and SMTP while using cloudflare
• PHP cURL sync and async
• mysql performance issues on large tables with insert
• Database search like google [duplicate]
• PHP SSE vs PHP WebSockets(Ratchet)
• php validate string with preg_match
• retrieve php server session timeout
• Database logs vs file logs
• PHP array combinations

NVG answers