PHP: Delete values from nested arrays

Question

I am extracting duplicated values from nested arrays. I would like to delete these extraceted items from the $bigarray. would you give me some ideas...?

$bigarray = array(                                                                                                                                                                                                                                                          
    "430" => array('milk', 'turky', 'apple'),
    "433" => array('milk', 'apple', 'orange', 'england'),
    "444" => array('milk', 'apple', 'orange', 'spain')
);
$intersected = null;
foreach ($bigarray as $arr) {
  $intersected = $intersected ? array_intersect($arr, $intersected) : $arr;
  if (!$intersected) {
    break; // no reason to continue
  }
}


foreach ($intersected as $inter){
  foreach ($bigarray as $arr) { 
    foreach ($arr as $value=>$key) {
      if ($key ==  $inter){
        unset($arr[$value]);
      }
    }
  //print_r($arr);
  }
}
print_r($bigarray );

saying what's wrong with your sample code would be a good way to start... — Marc B
– Marc B, Commented Feb 3, 2012 at 14:33
yes i"m extracting duplicates, but not deleting them. I would like to extract and delete them from the original arrays. — user973067
– user973067, Commented Feb 3, 2012 at 14:35
Once you know what the duplicates are ($intersected after the loop exits), you take that result and go back to the original arrays and delete those values. — Marc B
– Marc B, Commented Feb 3, 2012 at 14:37
I'M doing it like that but nothing is happening...>foreach ($clauses as $arr) {foreach ($arr as $value) { if($value == "Orange"){unset($value);} }print_r($arr);} — user973067
– user973067, Commented Feb 3, 2012 at 14:53
$value in that context is a COPY of whatever's in the array. You need to refer to the original array: unset($clauses[$key1][$key2]). — Marc B
– Marc B, Commented Feb 3, 2012 at 16:00

webnoob · Accepted Answer · 2012-02-03 14:35:05Z

1

You should look at array_merge as it will merge 2 arrays together and only keep one duplicate. From the manual:

If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.

Sounds like homework and the question isn't very clear so that is all I can provide for now.

answered Feb 3, 2012 at 14:35

webnoob

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Rezigned · Accepted Answer · 2012-02-03 14:34:30Z

0

Is this what you're looking for?

foreach($bigarray as $id => $arr)
    $bigarray[$id] = array_unique($arr);

answered Feb 3, 2012 at 14:34

Rezigned

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DaneoShiga · Accepted Answer · 2012-02-03 14:35:09Z

0

I don't completely understood your question, but using array_unique() in your array I've got the following output:

array(1) {
  [430]=>
  array(3) {
    [0]=>
    string(4) "milk"
    [1]=>
    string(5) "turky"
    [2]=>
    string(5) "Apple"
  }
}

Maybe this could be a way of acchieving what you want.

answered Feb 3, 2012 at 14:35

DaneoShiga

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Adam Fowler · Accepted Answer · 2012-02-03 14:37:08Z

function array_unique_nested($arr=array(),$matched=array(),$cm=false){
foreach($arr as $i=>$v){
if (is_array($v)) {$arr[$i]=array_unique_nested($v,$matched,false);
$matched=array_unique_nested($v,$matched,true); continue;}
if (in_array($v,$matched)) {unset($arr[$i]);continue;}
$matched[]=$v;}
if ($cm) return $matched;
else return $arr;}

In case that doesn't work, this code snippet from http://php.net/manual/en/function.array-unique.php should do the trick.

if( !function_exists( 'array_flat' ) )
{
    function array_flat( $a, $s = array( ), $l = 0 )
{
    # check if this is an array
    if( !is_array( $a ) )                           return $s;

    # go through the array values
    foreach( $a as $k => $v )
    {
        # check if the contained values are arrays
        if( !is_array( $v ) )
        {
            # store the value
            $s[ ]       = $v;

            # move to the next node
            continue;

        }

        # increment depth level
        $l++;

        # replace the content of stored values
        $s              = array_flat( $v, $s, $l );

        # decrement depth level
        $l--;

    }

    # get only unique values
    if( $l == 0 ) $s = array_values( array_unique( $s ) );

    # return stored values
    return $s;

} # end of function array_flat( ...

}

user1062893 · Accepted Answer · 2012-02-03 14:38:40Z

You can use the array_unique($array,[, int $sort_flags] function. if you don't specify the optional sort_flag, the function will compare values converting everything to string. if you have values other than string in the array, you can specify sort_flag to be one of the following values

SORT_REGULAR - compare items normally (don't change types)
SORT_NUMERIC - compare items numerically
SORT_STRING - compare items as strings
SORT_LOCALE_STRING - compare items as strings, based on the current locale.

Example from PHP.net

         $input = array("a" => "green", "red", "b" => "green", "blue", "red");
         $result = array_unique($input);
         print_r($result);

for more information refer http://php.net/manual/en/function.array-unique.php

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