- You should not use $a as your index variable, or really ever as a generic variable. $a and $b have special meaning for sort.
- I'm unclear on how your strategy splits the array into chunks of 100 records. There are certainly a myriad of ways to get this done, but it's not obvious to me how this is one of them.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.
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