Get duplicated array value only once in foreach php

Question

My array has 12 news items with titles, descriptions and category name

I have only 4 categories ( 3 items each) and need to create categories menu but if I get them from items array I have 12 category names(3x each) as a result. How can I echo category names only once if it was already printed ?

$myarray print:

   [0] => Array
        (
            [title] => Item 1
            [desc] => Sed venenatis bibendum nisl, eget iaculi
            [cat_title] => Category 1
        )

    [1] => Array
        (
            [title] => Item 1
            [desc] => Sed venenatis bibendum nisl, eget iaculi
            [cat_title] => Category 2
        )
    [2] => Array
        (
            [title] => Item 2
            [desc] => Sed venenatis bibendum nisl, eget iaculi
            [cat_title] => Category 2
        )...

loop:

   foreach( $myarray as $key=>$item){

       echo $item['category_name'];
    }

Note: I am not able to know how many categories wil the re be , it can be one or more. Currently there is 4. Any help is appreciated . Thank you!

Is this data, by any chance the result of a query, because if it is, odds are you could work on the query, and get what you need that way. It'll probably even be more performant than what you're doing now... — Elias Van Ootegem
– Elias Van Ootegem, Commented Sep 19, 2013 at 13:19
Elias won my comment. If this is coming from the database, you're solving this problem at the wrong level. By the way, in your loop the $key=>$item is not necessary for your example. — ILikeTacos
– ILikeTacos, Commented Sep 19, 2013 at 13:20
Yes it is coming from the DB the issue is I am dealing with a DB print template ad cant mess with actual db query. That was my first try and I had the query bu the issue is I would end up with my query and the one that is loading by default which I am not supposed to touch. — Benn
– Benn, Commented Sep 19, 2013 at 13:23

David Barker · Accepted Answer · 2013-09-19 13:17:25Z

6

Map the array categories to a simple array and then remove all duplicate values.

$categories = array_unique(array_map(function($val) {
    return $val['cat_title'];
}, $myarray));

foreach($categories as $cat) {
    echo $cat;
}

answered Sep 19, 2013 at 13:17

David Barker

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Comments

Jason OOO · Accepted Answer · 2013-09-19 13:16:01Z

1

You can create temp array:

$temp = array();
foreach( $myarray as $key=>$item){
 if(!in_array($item['category_name'], $temp)){
       echo $item['category_name'];
       $temp[] = $item['category_name'];
 }
}

answered Sep 19, 2013 at 13:16

Jason OOO

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2 Comments

Benn Over a year ago

Very nice , but Davids is bit cleaner.

Jason OOO Over a year ago

@Benn yes I agree with you also :)

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