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php 6 on, then sort the array by number of purchases to see who your most loyal customers are.
When it comes to sorting arrays, PHP provides no less than twelve functions that you can use to sort an array. The more common ones are:
<span>sort() and rsort() — For sorting indexed arrays asort() and arsort() — For sorting associative arrays ksort() and krsort() — For sorting associative arrays by key rather than by value array_multisort
last interval [days]
repetition number in this series
scheduled repetition interval
last repetition or drill
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