How can server resources be effectively managed to handle high traffic in PHP applications?

To effectively manage server resources to handle high traffic in PHP applications, it is important to optimize code efficiency, utilize caching mechanisms, and scale resources as needed. Implementing techniques such as opcode caching, database query optimization, and using content delivery networks can also help improve performance under high traffic conditions.

// Example of using opcode caching with PHP
// Enable opcode caching in php.ini
// opcache.enable=1
// opcache.enable_cli=1
// opcache.memory_consumption=128
// opcache.interned_strings_buffer=8
// opcache.max_accelerated_files=4000
// opcache.revalidate_freq=60