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This article will explain in detail how to delete duplicates in php. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Delete duplicates

You have a large array of duplicates and you want to delete them so that they only have an array of unique values.

Regular array_unique ($array); alternative array_keys (array_flip ($array)); performance

I created an array containing more than 4 million elements and 3 million duplicates. This is the best result:

Method execution time processing time array_unique787.31 milliseconds array_keys array_flip434.03 milliseconds

The alternative method is 1.8 times faster (44.87%) in this measurement. On average, the speed has increased by about 1.5 times (30%). Trade-off: this applies only to simple one-dimensional arrays, because array_flip replaces keys with values.

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