What are the best practices for optimizing PHP code to improve page load speed and reduce server load?

To optimize PHP code for improved page load speed and reduced server load, it is important to minimize database queries, use caching techniques, enable gzip compression, and utilize opcode caching. Additionally, optimizing loops, reducing unnecessary code, and utilizing efficient algorithms can also help in improving performance. 

// Example of optimizing PHP code by minimizing database queries
// Instead of making multiple queries, combine them into a single query using JOIN

// Inefficient way
$result1 = mysqli_query($connection, "SELECT * FROM table1 WHERE condition1");
$result2 = mysqli_query($connection, "SELECT * FROM table2 WHERE condition2");

// Optimized way
$result = mysqli_query($connection, "SELECT * FROM table1 JOIN table2 ON table1.id = table2.id WHERE condition1 AND condition2");

Keywords

caching opcode profiling lazy loading database indexing

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