CODEWITHSUNDEEP
phparrays
Cristian
Cristian

Reputation: 7165

PHP multidimensional array duplicate

I've looked all over the web for a reason why I can't remove duplicates from my array. I am aware of array_unique but it's not working.

I have an array called $links which is populated from the links found in html source code

If i then echo out

$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>";
if(preg_match_all("/$regexp/siU", $html, $links, PREG_SET_ORDER)) {
    foreach($links as $link) {
        echo($link[2]."<br />"); // $link[2] = address, $link[3] = text
    }
}

it outputs each link to a new line perfectly, however there are duplicates

$link[2] is the only dimension of the array i am interested in, and i cannot remove its duplicates, can anyone help?

This is what is echoed out, for example

/
/register
/forgotpass
/
/news
/news
/news/submit_article
#
/recruiters/companies
/recruiters/headhunters
/jobs
/jobs
/jobs/submit_job
/about
/jobs
/jobs/submit_job
/resume
/register
/fullmap

I would hope to see

/
/register
/forgotpass
/news
/news/submit_article
#
/recruiters/companies
/recruiters/headhunters
/jobs
/about
/jobs/submit_job
/resume
/fullmap

FIXED BY JON - ANSWER:

$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>";
if(preg_match_all("/$regexp/siU", $html, $links, PREG_SET_ORDER)) {
    $unique_links = array_unique(array_map(function($item) { return $item[2]; }, $links));
    foreach($unique_links as $link) {
        echo($link."<br />");
    }
}

Upvotes: 0

Views: 223

Answers (2)

Magento Guy
Magento Guy

Reputation: 2493

If all you want to do is filter duplicate entries, you can do so by loading them into an array and using in_array() to determine if they're already there.

$regexp = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>";
if(preg_match_all("/$regexp/siU", $html, $links, PREG_SET_ORDER)) {
  $filter_links = array();
  foreach ($links as $link) {
    if (!in_array($filter_links)) {
      $filter_links[] = $link[2];
      echo $link[2]."<br />";
    }
  }
}

EDIT: But the answer above is a better solution :)

Upvotes: 0

Jon
Jon

Reputation: 437554

You can simply extract the "row" you are interested in from the array and call array_unique on that:

$unique_links = array_unique(array_map(function($item) { return $item[2]; }, $links));

This code will only run on PHP >= 5.3 due to the lambda syntax, but you can also use create_function for earlier PHP versions.

See it in action.

Upvotes: 3

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