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@ 2020-03-10T14:32:48Z

<?php

$a = [1, 2];
$b = $a;

$a[] = 3;
$b[] = 4;

echo "When next index=2 and max key=2, next key is both 2.\n";
var_dump($a, $b); // $a = [0=>1, 1=>2, 2=>3]  $b = [0=>1, 1=>2, 2=>4]


$a = [1, 2];
unset($a[1]);
$b = $a;

$a[] = 3;
$b[] = 4;

echo "\nWhen next index=2 and max key=1, next key is both 2. \n";
var_dump($a, $b); // $a = [0=>1, 2=>3]  $b = [0=>1, 2=>4]


$a = [1, 2];
unset($a[1], $a[0]);
$b = $a;

$a[] = 3;
$b[] = 4;

echo "\nWhen next index=2 and max key=0, next key is 0 or 2.";
var_dump($a, $b); // $a = [0=>3]  $b = [2=>4]  what?


$a = [1, 2];
unset($a[1], $a[0]);
$b = $a;

$b[] = 4;
$a[] = 3;

echo "\nIf reverse variable, result is reverse too.\n";
var_dump($a, $b); // $a = [2=>3]  $b = [0=>4]  what??

$a = [1, 2];
unset($a[1], $a[0]);
$b = $c = $d = $a;

$a[] = 3;
$b[] = 4;
$d[] = 6;
$c[] = 5;

echo "\nWhen increase variables, only the last one take over key..\n";
var_dump($a, $b, $c, $d); // $c's key is 2, others are 0

Output for git.master, git.master_jit, rfc.property-hooks: When next index=2 and max key=2, next key is both 2. array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) } array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(4) } When next index=2 and max key=1, next key is both 2. array(2) { [0]=> int(1) [2]=> int(3) } array(2) { [0]=> int(1) [2]=> int(4) } When next index=2 and max key=0, next key is 0 or 2.array(1) { [2]=> int(3) } array(1) { [2]=> int(4) } If reverse variable, result is reverse too. array(1) { [2]=> int(3) } array(1) { [2]=> int(4) } When increase variables, only the last one take over key.. array(1) { [2]=> int(3) } array(1) { [2]=> int(4) } array(1) { [2]=> int(5) } array(1) { [2]=> int(6) }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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