How do I remove an array elements from another array?

Question

I have this array. How do I remove all those elements which are present in another array i.e. $remove and re-index the final array starting from 1 not 0?

  $info =  array(
    '1' => array('name' => 'abc', 'marks' => '56'),
    '2' => array('name' => 'def', 'marks' => '85'),
    '3' => array('name' => 'ghi', 'marks' => '99'),
    '4' => array('name' => 'jkl', 'marks' => '73'),
    '5' => array('name' => 'mno', 'marks' => '59')
  );
  $remove = array(1,3);

Desired Output:

  $info =  array(
    '1' => array('name' => 'def', 'marks' => '85'),
    '2' => array('name' => 'jkl', 'marks' => '73'),
    '3' => array('name' => 'mno', 'marks' => '59')
  );

So far I've tried these two methods. Nothing worked for me.

  if (($key = array_search(remove[0], $info))) {
    unset($info[$key]);
    $info = array_values($info);
  }

And

  $result = array_diff($info, $remove);

Do you need to keep the array as an associated array like that with specified keys? — Ding
– Ding, Commented May 1, 2013 at 22:02

nickb · Accepted Answer · 2013-05-01 22:04:48Z

1

Something like this will work:

$result = array_diff_key( $info, array_flip( $remove));

This array_flip()s your $remove array so the keys become the values and the values becomes the keys. Then, we do a difference against the keys with array_diff_key() of both arrays, to get this result:

Array
(
    [2] => Array
        (
            [name] => def
            [marks] => 85
        )

    [4] => Array
        (
            [name] => jkl
            [marks] => 73
        )

    [5] => Array
        (
            [name] => mno
            [marks] => 59
        )

)

Finally, to yield your exact output, you can reindex your array by passing it through array_values(), but this will yield sequential indexes starting at zero, not one:

$result = array_values( array_diff_key( $info, array_flip( $remove)));

If you really need indexes to start at one, you will need a combination of array_combine() and range():

$result = array_diff_key( $info, array_flip( $remove));
$result = array_combine( range( 1, count( $result)), $result);

edited May 1, 2013 at 22:04

answered May 1, 2013 at 21:56

nickb

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1 Comment

dbf Over a year ago

And then re-index the keys (starting from 1 somehow) and you're done ;)

Fabio · Accepted Answer · 2013-05-01 21:57:41Z

0

What about using array_diff function?

Example

$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);

this will output

Array
(
    [1] => blue
)

answered May 1, 2013 at 21:57

Fabio

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