How to compare the size of two arrays-php Tutorial

How can we compare the sizes of two arrays? an array is read by the database. an array is written cyclically. & nbsp; for ($ iiA; $ ii & lt; E; $ ii ++) {for ($ i1; $ I & lt; 10; $ I ++) {if ($ q! $ Rack_id. $ ii. $ I) {echo & quot; how to compare the size of two arrays
An array is read by the database, and an array is written cyclically.
For ($ ii = 'a'; $ ii <'e'; $ ii ++ ){
For ($ I = 1; $ I <10; $ I ++ ){

If ($ q! = $ Rack_id. $ ii. $ I)
{
Echo" ". $ Rack_id. $ ii. $ I ."";
}
}
}

For example
A02B2
A02B3
A02B4
A02B5
A02B6

Cyclic generation, for example:
A02B2
A02B3
A02B4
A02B5
A02B6
B02B2
B02B3
B02B4
B02B5
B02B6
How to remove duplicates?

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Compare the size of the array?
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Array_diff
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Array_diff.