Req #61946 [Opn->Csd]: Implement array_first() and array_last()
Edit report at https://bugs.php.net/bug.php?id=61946&edit=1
ID: 61946
Updated by: cmb@php.net
Reported by: phristen at yahoo dot com
Summary: Implement array_first() and array_last()
-Status: Open
+Status: Closed
Type: Feature/Change Request
Package: Arrays related
PHP Version: Irrelevant
-Assigned To:
+Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
Indeed, array_key_first() and array_key_last() are available as of
PHP 7.3.0. array_value_first() and array_value_last() have been
explicitly rejected, since the easily can be implemented in
userland (or used inline).
Previous Comments:
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[2018-08-12 22:57:22] carusogabriel@php.net
> Also consider implementing another pair of function to retrieve the keys: array_first_key and
> array_last_key.
These two functions were implemented via https://wiki.php.net/rfc/array_key_first_last
in PHP 7.3
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[2012-05-05 03:22:52] phristen at yahoo dot com
This is a very basic operation, and it should be done in a single function call.
I know about reset(), and I think it's ridiculous to have to call it every time I need to get
the last element. It's also easy to 'forget' to reset it, and mess up your arrays.
And it's gonna turn into a terrible mess when you have to use first and last in a single
statement (e.g. comparing first to last inside an if())
P.S.
I just used key() in my example to demonstrate that array_last should not change the internal
pointer.
------------------------------------------------------------------------
[2012-05-05 02:56:13] reeze dot xia at gmail dot com
But from my point view, I'd like those functions. It really makes
code more easy to read.
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[2012-05-05 02:44:42] reeze dot xia at gmail dot com
Hi, phristen,
you request can be easily satisfied by using:
$array = array(1, 2, 3);
reset($array); // point to the first element
echo key($array); // the first key: 0
echo current($array); // first value
end($array); // now point to the last values
echo key($array); // last key
echo current($array); // last value
please refer to : http://www.php.net/manual/en/function.reset.php
----------------------
BTW: if you want to get all of keys of an array,
you could use array_keys() but not key() :)
Thanks.
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[2012-05-05 02:22:29] phristen at yahoo dot com
Description:
------------
Retrieving the first or the last element of an array (without modifying the array) is a very common
task.
It is really annoying that PHP wouldn't come with built-in functions to do that.
Can you please implement the following 2 array functions:
array_first(array $array) - returns the first element of $array
array_last(array $array) - returns the last element of $array
Also consider implementing another pair of function to retrieve the keys: array_first_key and
array_last_key.
Test script:
---------------
$test = array(
100 => "a",
200 => "b",
300 => "c",
400 => "d");
echo array_first($test)."\n";
echo array_last($test)."\n";
echo key($test)."\n";
echo implode(",", $test);
Expected result:
----------------
a
d
100
a,b,c,d
Actual result:
--------------
Fatal error: Call to undefined function array_first() on line 3
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Edit this bug report at https://bugs.php.net/bug.php?id=61946&edit=1
Thread (6 messages)