PHP - value of previous key in foreach loop

Question

I have a sql query that is returning me rows like this:

ID | Code | Numb 1 | 1 | 1 2 | 2 | 2 3 | 3 | 3

and I am trying to write foreach loop that will always show the previous values.

My normal foreach loop like this:

foreach($array as $key => $val) { echo '$val['code']; }

how can i make the value to always be from the previous row?

What's your expected output? The question is not clear as not sure why you would want to do this. — Lawrence Cherone
– Lawrence Cherone, Commented Jan 14, 2018 at 9:14
the loop always with zero, if you want specific value before key, we can get — jvk
– jvk, Commented Jan 14, 2018 at 9:15
my goal is when the loop is echoing the second code which is 2 it should be 1 @LawrenceCherone then the third code will be 2 — Fahad
– Fahad, Commented Jan 14, 2018 at 11:21
Then you should accept @Sohel0415 answer as it does exactly that (though a little untidy). — Lawrence Cherone
– Lawrence Cherone, Commented Jan 14, 2018 at 11:36

Sohel0415 · Accepted Answer · 2018-01-14 09:34:26Z

1

You could kept your old value to a variable and use it at the next iteration. And as @Daniel notices, you need to check that variable defined or not by using isset().

foreach($array as $key => $val) {
  if(isset($prev)) 
     echo $prev;
  $prev = $val['code'];
}

edited Jan 14, 2018 at 9:34

answered Jan 14, 2018 at 8:48

Sohel0415

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4 Comments

Daniel Over a year ago

First time echo $prev; is undefined. You should check it if(isset($prev)) echo $prev;

Matt Over a year ago

You would have to echo once more outside of the loop for the final item.

Sohel0415 Over a year ago

@Matt Yes, If he needs, he should, I just consider the previous data part

Fahad Over a year ago

@Sohel0415, I have tried and it worked fine .. thank you

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