PHP - remove element in multidimensional array - arrays

Question

I have this array:
Array (
[0] => Array ( [0] => b [1] => d [2] => **c** [3] =>a [4] => )
[1] => Array ( [0] => **c** [1] => a [2] => d [3] => [4] => )
[2] => Array ( [0] => b [1] => d [2] => a [3] => [4] => )
[3] => Array ( [0] => **c** [1] => d [2] => a [3] =>b [4] => )
)
and need to delete (unset?) all elements where value is "c" so that one ends up with:
Array (
[0] => Array ( **[0] => b [1] => d [2] => a [3] => [4] =>** )
[1] => Array ( **[0] => a [1] => d [2] => [3] =>** )
[2] => Array ( [0] => b [1] => d [2] => a [3] => [4] => )
[3] => Array ( **[0] => d [1] => a [2] =>b [3] =>** )
)
The element gets removed, and the other elements to shift up. I know that unset does not re-index the array. Cannot get to unset for all multidimensional arrays, but only with one array. Can the arrays be re-indexed afterwards? Appreciate it.
The code BELOW removes elements where the value is equal to "c" but the index of the first element is not re-indexed. Can anyone suggest a solution to re-indexing the inner arrays?
$i=0;
foreach ($array as $val)
{
foreach ($val as $key => $final_val)
{
if ($final_val =="$search_value")
{
unset($array[$i][$key]);
}
}
i = $i + 1;
}

Answer 1

The following code will do what you want:
<?php
$a = 1;
$b = 2;
$c = 3;
$d = 4;
$arr = array(
array ( $b, $d, $c, $a, $b),
array ($c, $a),
array ( $b, $d, $c ),
array( $c, $d, $a, $b, $b)
);
echo "before:\n";
print_r($arr);
foreach($arr as $k1=>$q) {
foreach($q as $k2=>$r) {
if($r == $c) {
unset($arr[$k1][$k2]);
}
}
}
echo "after:\n";
print_r($arr);
?>
Output:
before:
Array
(
[0] => Array
(
[0] => 2
[1] => 4
[2] => 3
[3] => 1
[4] => 2
)
[1] => Array
(
[0] => 3
[1] => 1
)
[2] => Array
(
[0] => 2
[1] => 4
[2] => 3
)
[3] => Array
(
[0] => 3
[1] => 4
[2] => 1
[3] => 2
[4] => 2
)
)
after:
Array
(
[0] => Array
(
[0] => 2
[1] => 4
[3] => 1
[4] => 2
)
[1] => Array
(
[1] => 1
)
[2] => Array
(
[0] => 2
[1] => 4
)
[3] => Array
(
[1] => 4
[2] => 1
[3] => 2
[4] => 2
)
)
As you can see, all the 3's have gone...

Answer 2

Search the value in the sub array then unset it.
$search = 'c';
$result = array_map(function ($value) use ($search) {
if(($key = array_search($search, $value)) !== false) {
unset($value[$key]);
}
return $value;
}, $your_array);
Or you could use a loop too:
// this way change your original array
foreach ($your_array as &$sub_array) {
if(($key = array_search($search, $sub_array)) !== false) {
unset($sub_array[$key]);
}
}
var_dump($your_array);