delete all values from an array while keeping keys intact - php

Question

Do I really have to do this to reset an array?
foreach ($array as $i => $value) {
unset($array[$i]);
}
EDIT:
This one makes more sense, as the previous one is equivalent to $array=array();
foreach ($array as $i => $value) {
$array[$i]=NULL;
}

Answer 1

$keys = array_keys($array);
$values = array_fill(0, count($keys), null);
$new_array = array_combine($keys, $values);
Get the Keys
Get an array of nulls with the same number of elements
Combine them, using keys and the keys, and the nulls as the values
As comments suggest, this is easy as of PHP 5.2 with array_fill_keys
$new_array = array_fill_keys(array_keys($array), null);

Answer 2

Fill array with old keys and null values
$array = array_fill_keys(array_keys($array), null)

Answer 3

There is no build-in function to reset an array to just it's keys.
An alternative would be via a callback and array_map():
$array = array( 'a' => 'foo', 'b' => 'bar', 'c' => 'baz' );
With regular callback function
function nullify() {}
$array = array_map('nullify', $array);
Or with a lambda with PHP < 5.3
$array = array_map(create_function('', ''), $array);
Or with lambda as of PHP 5.3
$array = array_map(function() {}, $array);
In all cases var_dump($array); outputs:
array(3) {
["a"]=> NULL
["b"]=> NULL
["c"]=> NULL
}

Answer 4

Define this function and call it whenever you need it:
function erase_val(&$myarr) {
$myarr = array_map(create_function('$n', 'return null;'), $myarr);
}
// It's call by reference so you don't need to assign your array to a variable.
// Just call the function upon it
erase_val($array);
That's all!

Answer 5

Get the array keys, then use them to create a new array with NULL values:
array_fill_keys(array_keys($array), NULL);
About array_fill_keys():
The array_fill_keys() function fills an array with values, specifying keys.
About array_keys():
The array_keys() function returns all the keys of an array.

Answer 6

foreach($a as &$v)
$v = null;
The reasoning behind setting an array item to null is that an array needs to have a value for each key, otherwise a key makes no sense. That is why it is called a key - it is used to access a value. A null value seems like a reasonable choice here.
Wrap it in a [reusable] procedure:
function array_purge_values(&$a) {
foreach($a as &$v)
$v = null;
}
Keep in mind though that PHP versions 5.3 and those released later, pass values to functions by reference by default, i.e. the ampersand preceding argument variable in the function declaration is redundant. Not only that, but you will get a warning that the notion is deprecated.

Answer 7

If you need to nullify the values of a associative array you can walk the whole array and make a callback to set values to null thus still having keys
array_walk($ar,function(&$item){$item = null;});
In case if you need to nullify the whole array just reassign it to empty one
$ar = array();

Answer 8

unset would delete the key, You need to set the value to null or 0 as per your requirement.
Example

Answer 9

I don't get the question quite well, but your example
foreach ($array as $i => $value) {
unset($array[$i]);
}
is equivilent to
$array = array();

Answer 10

Why not making an array with required keys and asinging it to variable when you want reset it?
function resetMyArr(&$arr)
{
$arr = array('key1'=>null,'key2'=>null);
}

Answer 11

This is a fairly old topic, but since I referenced to it before coming up with my own solution for a more specific result, so therefore I will share with you that solution.
The desired result was to nullify all values, while keeping keys, and for it to recursively search the array for sub-arrays as well.
RECURSIVELY SET MULTI-LEVEL ARRAY VALUES TO NULL:
function nullifyArray(&$arrayData) {
if (is_array($arrayData)) {
foreach ($arrayData as $aKey => &$aValue) {
if (is_array($aValue)) {
nullifyArray($aValue);
} else {
$aValue = null;
}
}
return true; // $arrayData IS an array, and has been processed.
} else {
return false; // $arrayData is NOT an array, no action(s) were performed.
}
}
And here is it in use, along with BEFORE and AFTER output of the array contents.
PHP code to create a multilevel-array, and call the nullifyArray() function:
// Create a multi-level array.
$testArray = array(
'rootKey1' => 'rootValue1',
'rootKey2' => 'rootValue2',
'rootArray1' => array(
'subKey1' => 'subValue1',
'subArray1' => array(
'subSubKey1' => 'subSubValue1',
'subSubKey2' => 'subSubValue2'
)
)
);
// Nullify the values.
nullifyArray($testArray);
BEFORE CALL TO nullifyArray():
Array
(
[rootKey1] => rootValue1
[rootKey2] => rootValue2
[rootArray1] => Array
(
[subKey1] => subValue1
[subArray1] => Array
(
[subSubKey1] => subSubValue1
[subSubKey2] => subSubValue2
)
)
)
AFTER CALL TO nullifyArray():
Array
(
[rootKey1] =>
[rootKey2] =>
[rootArray1] => Array
(
[subKey1] =>
[subArray1] => Array
(
[subSubKey1] =>
[subSubKey2] =>
)
)
)
I hope it helps someone/anyone, and Thank You to all who previously answered the question.

Answer 12

And speed test
This test shows speed when clearing a large array
$a1 = array();
for($i=0;$i<=1000;$i++)
{
$a1['a'.$i] = $i;
}
$b = $a1;
$start_time = microtime(TRUE);
foreach ($a1 as $field => $val) {
$a1[$field]=NULL;
}
$end_time = microtime(TRUE);
$duration = $end_time - $start_time;
var_dump( $duration*1000 );
var_dump('all emelent of array is '.reset($a1));
$start_time = microtime(TRUE);
$allkeys = array_keys($b);
$newarray = array_fill_keys($allkeys, null);
$end_time = microtime(TRUE);
$duration = $end_time - $start_time;
var_dump( $duration*1000 );
var_dump('all emelent of array is '.reset($newarray));

Answer 13

Just do this:
$arrayWithKeysOnly = array_keys($array);
http://php.net/manual/en/function.array-keys.php
EDIT: Addressing comment:
Ok, then do this:
$arrayWithKeysProper = array_flip(array_keys($array));
http://www.php.net/manual/en/function.array-flip.php
EDIT: Actually thinking about it, that probably won't work either.