CODEWITHSUNDEEP
phparraysforeachfilteringwhitelist
Lelly
Lelly

Reputation: 968

Only print array row data if id is found in a whitelist array

I have a list of categories for my videos, and with this simple foreach loop, I'm displaying all of them inside hyperlinks.

Now, what I want to do is display only some of them, based on the category ID.

Code that display all the categories:

$idx = 0;

foreach ($this->categories as $category) 
{
    echo "\n" . ($idx++ ? '| ' : '') . '<a href="' . KM_Helpers::getCategoryURL($category) . '">' . $category['name'] . '</a>';
}

Let's say now I want to display only the categories with the ids: 2,8,21,22. I can use $category['id'] to get the IDS.

I was thinking of having an array that contains only the ID I want to show...

$myarray = array(2, 8, 21, 22);

My question is, how can I loop in my $category array, displaying only the ID contained in the array? (Based on $category['id'] )

Upvotes: 0

Views: 172

Answers (4)

Mark Reed
Mark Reed

Reputation: 95242

If the id value matches the index in the categories array, you can just loop over the ones you want:

foreach ($myarray as $id)
{
  $category = $this->categories[$id];
  echo "\n".($idx++ ? '| ' : '') .
    '<a href="' . KM_Helpers::getCategoryURL($category) . '">' .
     $category['name'] . '</a>';
}

Otherwise, you have to do a double-loop (possibly hidden by in_array), either to check if an id is valid or to find the category with a given valid id.

Upvotes: 2

472084
472084

Reputation: 17885

$ids= array(2, 8, 21, 22);

$idx = 0;
foreach($this->categories as $id => $category){
    if (in_array($category['id'] , $ids)) {
        echo "\n".($idx++ ? '| ' : '').'<a href="'.KM_Helpers::getCategoryURL($category).'">'.$category['name'].'</a>';
    }
}

Upvotes: 1

Surreal Dreams
Surreal Dreams

Reputation: 26380

Not a problem. Add in some simple logic to test if the id is on your list of "approved" ids:

$idx = 0;
$myarray = array(2, 8, 21, 22);

foreach($this->categories as $category) 
{
    if(in_array($category['id'], $myarray)
    {
        echo "\n".($idx++ ? '| ' : '').'<a href="'.KM_Helpers::getCategoryURL($category).'">'.$category['name'].'</a>';
    }
}

This tests the $category['id'] in each iteration of the loop and if it's in your array of ids, you echo the link. Otherwise the category item is ignored and the loop moves on.

Upvotes: 1

John Conde
John Conde

Reputation: 219804

$idx = 0;
$myarray = array(2, 8, 21, 22);
foreach($this->categories as $category) 
{
    if (!in_array($category['id'], $myarray)) {
        continue; // skip it if the id isn't in your array of accceptable IDs
    }
    echo "\n".($idx++ ? '| ' : '').'<a href="'.KM_Helpers::getCategoryURL($category).'">'.$category['name'].'</a>';
}

Upvotes: 1

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