How can PHP usage be optimized for performance?

To optimize PHP usage for performance, you can implement caching mechanisms to reduce database queries, use opcode caching to speed up script execution, minimize the use of include and require statements, and enable gzip compression to reduce file sizes transferred over the network. 

// Example of implementing opcode caching using OPcache extension
if (extension_loaded('Zend OPcache')) {
    ini_set('opcache.enable', 1);
    ini_set('opcache.enable_cli', 1);
    ini_set('opcache.memory_consumption', 128);
    ini_set('opcache.interned_strings_buffer', 8);
}

Keywords

Caching Opcode Profiling Database Query Optimization Load Balancing

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