How do I know the last iteration of for loop?

Question

I have a for loop in my code:

$d = count( $v2['field_titles'] );

for( $i=0; $i < $d; $i++ ) {
  $current = 3 + $i;
  echo 'current is' . $current;
}

How do I know the last iteration if I don't know exact number of $d?

I want to do something like:

$d = count( $v2['field_titles'] );

for( $i=0; $i < $d; $i++ ) {
  $current = 3 + $i;

  if( this is the last iteration ) {
   echo 'current is ' . $current; 
   // add sth special to the output
  }
  else {
    echo 'current is ' . $current;
  }
}

In this simple case, you just do the `add sth special to the output` after the loop completes. — p.s.w.g, Oct 20 '14 at 16:24
@Vohuman Not a duplicate at all. Did you read the content or only the title? — JasonMArcher, Oct 20 '14 at 16:41
@JasonMArcher The idea is the same. A super simple comparison. — Ram, Oct 20 '14 at 16:47
There is no duplicate like mentioned (1070244), since the other question is about FOREACH loop and the actual question is about a FOR loop. My Approach would be: `if($i+$increase > $sum) { $data->last = true; }` — Francis, Jun 23 '17 at 10:17

score 5 · Accepted Answer · answered Oct 20 '14 at 16:17

5

if($i==$d-1){
   //last iteration :)
}

answered Oct 20 '14 at 16:17

nicael

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score 0 · Answer 2 · answered Oct 20 '14 at 16:24

I prefer while, to for personally. I would do this:

$array = array('234','1232','234'); //sample array
$i = count($array); 
while($i--){ 
    if($i==0) echo "this is the last iteration"; 
    echo $array[$i]."<br>"; 
}

I've read that this type of loop is a little faster but havn't personally verified. It's certainly easier to read/write, imo.

in your case, this would translate to:

$d = count( $v2['field_titles'] );

while($d--) {
  $current = 3 + $d;

  if($d==0) {
   echo 'current is ' . $current; 
   // add sth special to the output
  }
  else {
    echo 'current is ' . $current;
  }
}

Thanks for your effort but I will use `for` anyways. – Rafff Oct 20 '14 at 16:37 — Rafff, Oct 20 '14 at 16:37

How do I know the last iteration of for loop?

2 Answers2