Remove duplicates in numbered array

Question

How do I remove duplicates from a array if it only should check in position [1] (fruit name)

Array ( 
    [0] => Array ( 
        [0] => 1 
        [1] => Apple
    ) 
    [1] => Array ( 
        [0] => 2 
        [1] => Pineapple 
    ) 
    [2] => Array ( 
        [0] => 1 
        [1] => Apple
    ) 
)

foreach over the parent array, add each value to a new array where the key is [0] from each array. Duplicates will just overwrite each other. You can then use array_values if you wanted to reset the keys back to zero. — Jonathan Kuhn
– Jonathan Kuhn, Commented May 25, 2016 at 16:17
What if i have more numbers/informations than the fruit name? Will it still work? — user1273409
– user1273409, Commented May 25, 2016 at 16:19
Oh, I was backwards. You can create the array with the key [1] as well. Either one would work. — Jonathan Kuhn
– Jonathan Kuhn, Commented May 25, 2016 at 16:21
could you show me? foreach {$array as $item} $array2 = $item[1]; — user1273409
– user1273409, Commented May 25, 2016 at 16:26
You showed the starting array. It would be helpful if you showed what the array should look like after duplicates are removed. — David Aman
– David Aman, Commented May 25, 2016 at 16:40

jiboulex · Accepted Answer · 2016-05-25 16:26:53Z

2

Use array_unique :

$arr = array_unique($arr, SORT_REGULAR);

the SORT_REGULAR flag compares the elements normally without changing types

http://php.net/manual/fr/function.array-unique.php

answered May 25, 2016 at 16:26

jiboulex

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2 Comments

user1273409 Over a year ago

Its not removing my duplicates.

Jonathan Kuhn Over a year ago

That's interesting that it does work, but the manual specifically states Note: Note that array_unique() is not intended to work on multi dimensional arrays, which this is.

Jonathan Kuhn · Accepted Answer · 2016-05-25 16:26:17Z

1

You can just foreach over the array and add each value to a temporary array where the key is [1] from each array. Duplicate values will just overwrite each other. You can then use array_values afterwards if you wanted to reset the keys back to numeric.

Here is an example:

<?php
$arr = array ( 
    array (1, 'Apple'),
    array (2, 'Pineapple'),
    array (1, 'Apple')
);
echo "Before:\n";
print_r($arr);

//create a temp array
$tmp = array();
foreach($arr as $v){
    $tmp[$v[1]] = $v;
}
//reset the keys
$arr = array_values($tmp);

echo "\n\nAfter:\n";
print_r($arr);

Demo: https://3v4l.org/KCECc

answered May 25, 2016 at 16:26

Jonathan Kuhn

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Comments

Ravinder Reddy · Accepted Answer · 2016-05-25 16:28:38Z

0

The below code may help you.

$array =array ( 
'0' => array ( '0' => 1, '1' => 'Apple'),
'1' => array ( '0' => 2, '1' => 'Pineapple' ), 
'2' => array ( '0' => 1, '1' => 'Apple') ,
);

$new_array = array();
foreach($array as $values){
    $trimmed_array=array_map('trim',$values);
    $new_array[$values[1]] = $values; 
}

print_r(array_values($new_array));

Out Put :

Array
(
  [0] => Array
    (
        [0] => 1
        [1] => Apple
    )

[1] => Array
    (
        [0] => 2
        [1] => Pineapple
    )

)

answered May 25, 2016 at 16:28

Ravinder Reddy

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