Cannot seem to loop through nested associative array

Question

I have googled to no avail I am missing something so fundamental I can't see it.

I have the following array

$this->links = array (
  0 => 
  array (
    'url' => 'http://maps.doc.govt.nz/Viewer/Index.html?viewer=rwa',
    'text' => 'DOC maps: Discover the outdoors ',
  ),
  1 => 
  array (
    'url' => 'https://booking.doc.govt.nz/',
    'text' => ' ',
  ),
  2 => 
  array (
    'url' => 'https://booking.doc.govt.nz/',
    'text' => ' Book Great Walks, selected huts, campsites and more.  ',
  ),
  3 => 
  array (
    'url' => 'https://careers.doc.govt.nz/jobtools/jncustomsearch.searchResults?in_organid=18174&in_searchBut=Search',
    'text' => 'Jobs at DOC ',
  ),
  4 => 
  array (
    'url' => 'http://blog.doc.govt.nz/',
    'text' => ' Conservation blog ',
  )....

I am trying to loop through it with this

foreach ($this->links as $arrayId) 
            {
            print "Link {\n";
            foreach ($arrayId as $linktitle=>$linkdetail)
                {
                echo 'link: -'.$linktitle .'<br/> bit'.$linkdetail;
                }
            }

But I am getting a Warning: Invalid argument supplied for foreach() error. I really don't know why its not working, I have also tried every variation I can think of?? Still getting the same error?

UPDATE I dump the variable and $links is described as an array however when I add an is_array condition it returns false??????

        var_dump($links); 

- string 'array (
  0 => 
  array (
    'url' => 'http://www.iana.org/domains/example',
    'text' => 'More information... ',

if (is_array($links))
{
    echo "Its an array";

} - does not return

$this is my class (a view). I have removed $this but still getting the same error — redstubble
– redstubble, Commented Sep 20, 2013 at 6:00

bansi · Accepted Answer · 2013-09-20 07:00:10Z

1

Your $this->links is a string. you need it to be an array. if you cannot change is to array where you are generating it you can try the following. I don't recommend the usage of eval(), and it must be used as a last resort only.

$alinks=array();
eval('$alinks='.$this->links.';');
foreach ($alinks as $arrayId) 
        {
        print "Link {\n";
        foreach ($arrayId as $linktitle=>$linkdetail)
            {
            echo 'link: -'.$linktitle .'<br/> bit'.$linkdetail;
            }
        }

Warning: The eval() language construct is very dangerous because it allows execution of arbitrary PHP code. Its use thus is discouraged. If you have carefully verified that there is no other option than to use this construct, pay special attention not to pass any user provided data into it without properly validating it beforehand.

http://php.net/manual/en/function.eval.php

answered Sep 20, 2013 at 7:00

bansi

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1 Comment

redstubble Over a year ago

AAaaargh I using var_export to echo the dump and I completely forgot about it.

Gareth McCumskey · Accepted Answer · 2013-09-20 05:41:07Z

0

The code looks ok but it is possible that the code that generates the value for $this->links is doing so erroneously. Try doing a print_r or var_dump of $this->links just before the first foreach and then do the same for the $arrayId before the second foreach and it may show you what is causing the problem. The only thing I can think of is that $this->links is not actually an array because of something previously not generating the data for it or assigning it correctly.

answered Sep 20, 2013 at 5:41

Gareth McCumskey

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1 Comment

redstubble Over a year ago

Thanks but I can var_dump the array fine

anupam · Accepted Answer · 2013-09-20 05:44:59Z

0

Remove $this as egig has mentioned if you are not using a class and try the following:

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
ini_set('log_errors', 0);

$links = array (
  0 =>
  array (
    'url' => 'http://maps.doc.govt.nz/Viewer/Index.html?viewer=rwa',
    'text' => 'DOC maps: Discover the outdoors ',
  ),
  1 =>
  array (
    'url' => 'https://booking.doc.govt.nz/',
    'text' => ' ',
  ),
  2 =>
  array (
    'url' => 'https://booking.doc.govt.nz/',
    'text' => ' Book Great Walks, selected huts, campsites and more.  ',
  ),
  3 =>
  array (
    'url' => 'https://careers.doc.govt.nz/jobtools/jncustomsearch.searchResults?in_organid=18174&in_searchBut=Search',
    'text' => 'Jobs at DOC ',
  ),
  4 =>
  array (
    'url' => 'http://blog.doc.govt.nz/',
    'text' => ' Conservation blog ',
  )
);

foreach ($links as $arrayId)
{
        print "Link {\n";
        foreach ($arrayId as $linktitle=>$linkdetail)
        {
                echo 'link: -'.$linktitle .'<br/> bit'.$linkdetail;
        }
}
?>

answered Sep 20, 2013 at 5:44

anupam

7665 silver badges11 bronze badges

2 Comments

redstubble Over a year ago

Thanks but I have removed $this and added the error reporting but still getting the same error. I did a var_dump to get my print out of the array so it is rendering fine?

anupam Over a year ago

@redstubble: Can you please post the entire array?

Janak Prajapati · Accepted Answer · 2013-09-20 06:15:09Z

try this

<?php
$this->links = array (
  0 => 
  array (
    'url' => 'http://maps.doc.govt.nz/Viewer/Index.html?viewer=rwa',
    'text' => 'DOC maps: Discover the outdoors ',
  ),
  1 => 
  array (
    'url' => 'https://booking.doc.govt.nz/',
    'text' => ' ',
  ),
  2 => 
  array (
    'url' => 'https://booking.doc.govt.nz/',
    'text' => ' Book Great Walks, selected huts, campsites and more.  ',
  ),
  3 => 
  array (
    'url' => 'https://careers.doc.govt.nz/jobtools/jncustomsearch.searchResults?in_organid=18174&in_searchBut=Search',
    'text' => 'Jobs at DOC '
  ));

echo "<pre>";

for($i=0;$i<=count($this->links)-1;$i++)
{
    foreach($this->links[$i] as $value)
    {
        print_r($value);
        echo "<br>";


    }
}
?>

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