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Determining the most effective method for reading the last several lines of a file (tail command equivalent) in PHP involves evaluating various approaches.
Overview of Approaches
After researching available solutions, they can be classified into three categories:
Solutions Evaluated
Five solutions were chosen for evaluation:
Performance Benchmarking
To determine optimal performance, tests were conducted on sample files of various sizes (100 KB, 10 MB, and 10 KB). Each solution was used to retrieve 1-1000 lines from the end of each file, with each test repeated ten times.
Results
For the 100 KB file, solutions #4 and #5 exhibited the best performance for most scenarios. Solution #1 performed poorly for larger file sizes, while solutions #2 and #3 performed well only when fetching a small number of lines.
For the 10 MB file, solution #5 remained the top performer, while solution #1 proved to be inadequate due to its heavy memory usage.
Recommended Solution
For general use cases, solution #5 is highly recommended. It displays consistent performance for all file sizes, particularly when retrieving a small number of lines.
Avoidance of Solutions
Solution #1 should be avoided for reading files larger than 10 KB. Solutions #2 and #3 are not optimal for most purposes.
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