PHP Performance Tips

PHP Performance Tips

• Use OPcache — pre-compiles scripts to bytecode (enable in php.ini)
• Avoid file_get_contents() in loops — read once, cache
• Use generators for large datasets — avoids loading all into memory
• Use array_key_exists() vs in_array() — O(1) vs O(n)
• String concatenation with . is slow in loops — use arrays + implode()
• Prefer isset() over array_key_exists() for null checks
• Use lazy loading and caching (Redis/Memcached)
• Profile with Xdebug or Blackfire.io
• Use SplFixedArray for large, fixed-size arrays

// OPcache — php.ini
opcache.enable=1
opcache.memory_consumption=256
opcache.max_accelerated_files=10000