How to remove values from an array whilst renumbering numeric keys - php

Question

I have an array which may contain numeric or associative keys, or both:
$x = array('a', 'b', 'c', 'foo' => 'bar', 'd', 'e');
print_r($x);
/*(
[0] => a
[1] => b
[2] => c
[foo] => bar
[3] => d
[4] => e
)*/
I want to be able to remove an item from the array, renumbering the non-associative keys to keep them sequential:
$x = remove($x, "c");
print_r($x);
/* desired output:
(
[0] => a
[1] => b
[foo] => bar
[2] => d
[3] => e
)*/
Finding the right element to remove is no issue, it's the keys that are the problem. unset doesn't renumber the keys, and array_splice works on an offset, rather than a key (ie: take $x from the first example, array_splice($x, 3, 1) would remove the "bar" element rather than the "d" element).

Answer 1

This should re-index the array while preserving string keys:
$x = array_merge($x);

Answer 2

You can fixet with next ELEGANT solution:
For example:
<?php
$array = array (
1 => 'A',
2 => 'B',
3 => 'C'
);
unset($array[2]);
/* $array is now:
Array (
1 => 'A',
3 => 'C'
);
As you can see, the index '2' is missing from the array.
*/
// SOLUTION:
$array = array_values($array);
/* $array is now:
Array (
0 => 'A',
1 => 'C'
);
As you can see, the index begins from zero.
*/
?>

Answer 3

I've come up with this - though I'm not sure if it's the best:
// given: $arr is the array
// $item is the item to remove
$key = array_search($item, $arr); // the key we need to remove
$arrKeys = array_keys($arr);
$keyPos = array_search($key, $arrKeys); // the offset of the item in the array
unset($arr[$key]);
array_splice($arrKeys, $keyPos, 1);
for ($i = $keyPos; $i < count($arrKeys); ++$i) {
if (is_int($arrKeys[$i])) --$arrKeys[$i]; // shift numeric keys back one
}
$arr = array_combine($arrKeys, $arr); // recombine the keys and values.
There's a few things I've left out, just for the sake of brevity. For example, you'd check if the array is associative, and also if the key you're removing is a string or not before using the above code.

Answer 4

Try array_diff() it may not order the new array correctly though
if not the following should work
You will need to iterate over it in the remove function.
function remove($x,$r){
$c = 0;
$a = array();
foreach ($x as $k=>$v){
if ($v != $r) {
if (is_int($k)) {
$a[$c] = $v;
$c++;
}
else {
$a[$k] = $v;
}
}
}
return $a;
}
DC

Answer 5

I don't think there is an elegant solution to this problem, you probably need to loop to the array and reorder the keys by yourself.