当限制和增量是动态的时，如何获得for循环的最后一次迭代？

Question

I have seen some question related to this one like

How to check for last loop when using for loop in php?

Last iteration of enhanced for loop in java

but I am not getting exact solution because in my case increment and end limit both are dynamic.

Requirement:- I do not want comma after last element printed.

$inc=11;
$end=100;
for($i=1;$i<=$end;$i=$i+$inc){
    echo $i==$end?$i:"$i,";  // 1,12,23,34,45,56,67,78,89,100
} 

In above code I know that last element($i) will be 100($end).

So I can write condition as $i==$end but in below case it won't work.

$inc=12;  // Now $inc is 12
$end=100;
for($i=1;$i<=$end;$i=$i+$inc){
    echo $i==$end?$i:"$i,";  // 1,13,25,37,49,61,73,85,97,
}

Now last element 97 has comma which I need to remove.

Thanks in advance.

Answer 1

You can just use,

echo $i+$inc>$end?$i:"$i,";

It checks whether this is the last possible iteration instead.