Duplicate words in PHP

Question

I have probably information about whether it is available in PHP to detect a duplicate and a book about not removing it and adding it to -1, -2, -3

Example:

$string = 'H4,H4,H3,WY21W,W5W,W5W,WY21W,W21/5W,W21/5W,W21W,W16W,W5W';

Result:

$output = 'H4,H4-1,H3,WY21W,W5W,W5W-1,WY21W-1,W21/5W,W21/5W-1,W21W,W16W,W5W-2'

Possible duplicate of [How do I check if a string contains a specific word?](https://stackoverflow.com/questions/4366730/how-do-i-check-if-a-string-contains-a-specific-word) — Sir Catzilla, Jan 11 '19 at 08:11
@Miaan - IMO that question indeed looks the same, but the answer does not fit in the scope of this question. This question is also about adding some data after the words. — Koen Hollander, Jan 11 '19 at 08:13
I was looking for such an example, however, I can not find. I just wrote that it removes duplicate values. — danko12, Jan 11 '19 at 08:19
@Danko12 - Please don't forget to mention everything you did, so we don't repeat those steps — Koen Hollander, Jan 11 '19 at 08:21
Possible duplicate of [php: rename duplicate keys by giving number in foreach](https://stackoverflow.com/questions/23540944/php-rename-duplicate-keys-by-giving-number-in-foreach) — Koen Hollander, Jan 11 '19 at 08:24

score 2 · Accepted Answer · answered Jan 11 '19 at 08:24

$string = 'H4,H4,H3,WY21W,W5W,W5W,WY21W,W21/5W,W21/5W,W21W,W16W,W5W';
$parts = explode(',', $string); // split by comma
$used = []; // array to count the number of occurrences
$result = []; // array to take the "new" elements

foreach($parts as $part) {
  if(isset($used[$part])) { // if there is an entry in the counter array already,
                            // increment it by one,
    $used[$part]++;
  }
  else {                    // else initialize with 0
    $used[$part] = 0;
  }
  // put part into new array, append -(counter) if counter > 0
  $result[] = $part . ($used[$part] ? '-'.$used[$part] : '');
}

echo implode(',', $result); // join together with comma

score 1 · Answer 2 · answered Jan 11 '19 at 08:39

Pretty much the same as misorude's answer.

<?php

$string = 'H4,H4,H3,WY21W,W5W,W5W,WY21W,W21/5W,W21/5W,W21W,W16W,W5W';
$values  = explode(',', $string);

foreach($values as $k => $value)
    if($counts[$value] = !isset($counts[$value]) ? 0 : $counts[$value]-1)
        $values[$k] = $value . $counts[$value];

print implode(',', $values);

Output:

H4,H4-1,H3,WY21W,W5W,W5W-1,WY21W-1,W21/5W,W21/5W-1,W21W,W16W,W5W-2

Duplicate words in PHP

2 Answers2