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up vote -3 down vote favorite

I have an array whose values are all arrays of a specific format that looks like this:

Array
(
    [0] => Array
        (
            [0] => 8227
            [1] =>  8138
        )

    [1] => Array
        (
            [0] => 8227
            [1] =>  8138
            [2] =>  7785
        )

)

and I would like to have this:

Array
(
    [0] => 8227
    [1] => 8138
    [2] => 7785
)

How can i do this ?

Thanks in advance....

share|improve this question
up vote 4 down vote accepted 
$result = array();
foreach ($input as $sub) { // Loop outer array
  foreach ($sub as $val) { // Loop inner arrays
    $val = trim($val);
    if (!in_array($val, $result)) { // Check for duplicates
      $result[] = $val; // Add to result array
    }
  }
}
share|improve this answer
    
php.net/manual/en/function.array-merge-recursive.php – ajreal Sep 12 '11 at 11:37
1  
@ajreal Doesn't work for this particular task, just spits aout exactly what you put in. – DaveRandom Sep 12 '11 at 11:41
    
Huh ? array_mege_recursive($array[0], $array[1] ...) ? – ajreal Sep 12 '11 at 11:52
    
@ajreal Doesn't remove duplicates (although you could call array_unique() afterwards), resulting keys may be non-contiguous from the array_unique() call (although you can pass it through array_merge()) but more to the point would only work if you knew exactly how many sub arrays are in the container array. If you do all the above, takes about 50% longer than the looping approach (tested on PHP/5.2.19 on win32 over 10000 iterations). – DaveRandom Sep 12 '11 at 12:00
up vote 3 down vote 
$result = array();
foreach($array as $arr){
    $result = array_merge($result, $arr);
}

$result = array_unique($result);
share|improve this answer
    
+1 for using keywords.. – Fero Sep 12 '11 at 11:45
    
+1. I like this, it's neater than mine, but is actually nearly twice as slow over 10000 iterations. This actually surprises me - I thought this would be faster - but there it is. – DaveRandom Sep 12 '11 at 11:46
    
if there is space in the beginning of the id's it returns duplicate values.. Is it possible to overcome it... for example if there is space in id 8227 it returns twice by using the above code.. is there any way to resolve ? – Fero Sep 12 '11 at 11:50
    
@Fero I have modified my answer so it strips leading/trailing whitespace from ID's and wont cause duplicates. However, if the whitespace is in the middle of the string you would probably be best using preg_replace() to get rid of it. – DaveRandom Sep 12 '11 at 12:04
up vote 1 down vote

array_merge_recursive() can be used to flatten the array. Then, array_unique() to get the unique values, with array_values() to "reindex" the resultant array.

$flat = call_user_func_array('array_merge_recursive', $subject);
$uniq = array_values(array_unique($flat));
share|improve this answer
up vote 0 down vote 
<?php
$array = array(
0 => array(
    0 => 8227,
    1 => 8138
),
1 => array(
    0 => 8227,
    1 => 8138,
    2 => 7785
)
);

$newArray = array();
array_walk_recursive($array, function($item, $key) use(&$newArray) {
if(!in_array($item, $newArray)) {
    $newArray[] = $item;
}
});

print_r($newArray);
?>
share|improve this answer

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