Get index of an element of an array in a loop

Question

I would like to get the index of the current element of an array in a loop. If I have this exemple :

<?php
  $array = array('a', 'b', 'c', 'd', 'e');
  foreach($array as $elem)
  {
    echo $elem;
  }
>

How could I get the index of elem in this loop (ex: 1 for 'b') ? I tried current($array) but the return value stay at 0 in my loop but with print_r() I have this.

print_r($array);
Array ( [0] => a [1] => b [2] => c [3] => d [4] => e )

Have you got any idea ?

`foreach($array as $idx => $elem)` then the index is in `$idx` — JustOnUnderMillions, Apr 10 '17 at 14:57
Please start taking a look around the excellent documentation. It will allow you to learn loads of useful things: http://php.net/manual/en/ref.array.php — arkascha, Apr 10 '17 at 14:59
With a new php version also: `print array_flip($array)['b'];` — JustOnUnderMillions, Apr 10 '17 at 14:59

score 0 · Answer 1 · answered Apr 10 '17 at 15:00

0

Try this;

foreach ($array as $key => $value) {
  echo $key;                              //<- for testing

  if($value==mayval)echo "The key is $key";
}

answered Apr 10 '17 at 15:00

KOUSIK MANDAL

2,002
1
21
46

score 0 · Answer 2 · answered Apr 10 '17 at 15:03

0

Use foreach ($array as $k => $v)

<?php
$array = array('a', 'b', 'c', 'd', 'e');
foreach($array as $k => $v) {
  echo $k . ' => ' . $v . PHP_EOL;
}

Output:

0 => a
1 => b
2 => c
3 => d
4 => e

https://eval.in/772092

answered Apr 10 '17 at 15:03

alistaircol

1,433
12
22

score 0 · Accepted Answer · answered Apr 10 '17 at 15:06

if you want all keys in an array, you can use array_keys() function.

If you want to check a key does exist in your array or not, use array_key_exists() function like: array_key_exists ( $key , $array );

or you simply want to access your keys, use foreach() like:

foreach($array as $key => $value){
    echo 'Key = '.$key.' , Value = '.$value;
}

Get index of an element of an array in a loop

3 Answers3