|  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #75611 array_slice BC breaking
Submitted: 2017-12-01 15:22 UTC Modified: 2017-12-01 15:31 UTC
From: nodex at icloud dot com Assigned:
Status: Not a bug Package: Arrays related
PHP Version: 7.1.12 OS: MacOs and Ubuntu
Private report: No CVE-ID: None
 [2017-12-01 15:22 UTC] nodex at icloud dot com
When using array_slice on a smaller array, PHP 7.1.4 (untested newer versions) returns a blank array if the size of the array is less than the $length parameter of array_slice

In php 5.6 this was not the case, the function simply returned the entire array if it was shorter.

Surely this must be a bug or are we now meant to count the array to check it's the right size before calling array_slice?

Test script:
# Basic reproduction test
$array = range(0,10);
$slice = array_slice($array,12); // same with and without the offset parameter!
print_r($slice); // Empty!

$array = range(0.5);
$slice = array_slice($array,3);
print_r($slice); // As expected 3 elements!


Add a Patch

Pull Requests

Add a Pull Request


AllCommentsChangesGit/SVN commitsRelated reports
 [2017-12-01 15:25 UTC]
Always been like that:
 [2017-12-01 15:29 UTC]
Also is in the docs: 

> If the offset is larger than the size of the array then returns an empty array. 

Also it seems like you are confusing the length (3rd param) with the offset (2nd param)
 [2017-12-01 15:30 UTC]
-Status: Open +Status: Not a bug
 [2017-12-01 15:30 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at
 [2017-12-01 15:31 UTC] nodex at icloud dot com
Hi. Thanks for your comment.

In php 5.6 it returns the entire array.

I don't think you have understaood what I meant so I'm sorry for that.

I am not sure how to explain it in a better way?
 [2017-12-01 15:37 UTC]
As you can see on 3v4l your repro script has the exact same output from PHP 4.2 all the way to 7.2:
PHP Copyright © 2001-2020 The PHP Group
All rights reserved.
Last updated: Mon Jul 06 21:01:04 2020 UTC