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Request #55633 New argument $invert for array_filter()
Submitted: 2011-09-07 11:58 UTC Modified: 2021-09-09 14:46 UTC
Avg. Score:3.0 ± 1.1
Reproduced:4 of 4 (100.0%)
Same Version:2 (50.0%)
Same OS:2 (50.0%)
From: vovan-ve at yandex dot ru Assigned:
Status: Suspended Package: Arrays related
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2011-09-07 11:58 UTC] vovan-ve at yandex dot ru
I think, it would be useful to add new argument $invert to array_filter() function. It will be most useful to use built-in functions as a callback. For example this call:

    $result = array_filter($values, 'is_null', true);

should to _remove_ all NULLs from array.

May be the parameter should be named $positive and have default value TRUE (and FALSE for inversion) to make code readable.

Test script:
$values = array(42, 'foo', false, null, array(), '');
  array_filter($values, null, true), // no callback - leave false value
  array_filter($values, 'is_null', true) // leave non-null values

Expected result:
array(5) {
  array(0) {
  string(0) ""
array(5) {
  string(3) "foo"
  array(0) {
  string(0) ""


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 [2012-01-23 22:39 UTC] gmblar+php at gmail dot com
Use Closures

$values = array(42, 'foo', false, null, array(), '');
var_dump(array_filter($values, function($value) {
    return !is_null($value);
 [2012-01-23 23:44 UTC] vovan-ve at yandex dot ru
> Use Closures

Usage of any user-defined function as a callback anywhere will reduce performance. I think, it is much better to improve array_filter() as mentioned above.
 [2012-08-21 02:51 UTC] vovan-ve at yandex dot ru
Related RFC was created: "array_delete() for elements deletion" -
 [2021-09-09 14:46 UTC]
-Status: Open +Status: Suspended
 [2021-09-09 14:46 UTC]
> Related RFC was created: […]

And is inactive for many years.  Anybody still interested in this
feature is welcome to pursue the RFC process[1].  For the time
being, I suspend this ticket.

[1] <>
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