Which PHP Array Transformation Method is Fastest: `foreach`, `array_map` with Lambda, or `array_map` with Static Function?

Performance Comparison of Element-Wise Transformations in PHP: Foreach, Map with Lambda, and Map with Static Function

Problem

Transforming an array to another array is a common task in PHP. Three commonly used approaches are foreach loops, array_map with lambda functions, and array_map with static functions. It is important to understand the performance differences between these approaches to make informed decisions when selecting the most suitable solution.

Methodology

We performed benchmarks using a PHP script that transformed an array of 1000 numbers by multiplying them by 10. The script was run with and without Xdebug for accurate performance measurements.

Results

With Xdebug

Approach	Time
Foreach	0.792325 seconds
Map with Lambda	4.108242 seconds
Map with Static Function	1.788457 seconds

Without Xdebug

Approach	Time
Foreach	0.698307 seconds
Map with Lambda	0.785845 seconds
Map with Static Function	0.851253 seconds

Observations

• Without Xdebug, there is a minimal performance difference between foreach and closure versions.
• Map with lambda shows a significant overhead compared to foreach and map with static function, especially with Xdebug enabled.
• Closures with use statements impact performance, affecting the closure version more than the foreach version.

Additional Approach

Another approach worth considering is using a custom function in place of a lambda function for array_map. This can potentially improve performance in certain scenarios, although benchmarks are required for specific use cases.

Choosing the Most Suitable Approach

The preferred approach depends on factors such as:

• Code complexity: Foreach loops are simpler to write, especially for small data sets.
• Clarity: Lambda functions offer better code clarity, especially when single-use transformations are required.
• Performance: Map with static functions generally provides the best performance, especially for large data sets.
• Memory usage: Lambda functions can result in higher memory usage than static functions.

In conclusion, while the performance differences are noticeable, the choice between foreach, map with lambda, or map with static function should be made based on the specific requirements and constraints of each project.

The above is the detailed content of Which PHP Array Transformation Method is Fastest: `foreach`, `array_map` with Lambda, or `array_map` with Static Function?. For more information, please follow other related articles on the PHP Chinese website!