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@ 2014-01-18T21:52:58Z

<?php

$a = array('foo' => "xyz", null => "abc");
$b = array('bar' => "baz", null => "xyz");


print_r(array_merge_recursive($a,$b));
print_(merge_old($a,$b));
print_(merge($a,$b));


function merge(array $a, array $b)
    {
        foreach ($b as $key => $value) {
            if (isset($a[$key])) {
                if (is_int($key)) {
                    $a[] = $value;
                } elseif (is_array($value) && is_array($a[$key])) {
                    $a[$key] = merge($a[$key], $value);
                } else {
                    $a[$key] = $value;
                }
            } else {
                $a[$key] = $value;
            }
        }

        return $a;
    }

function merge_old(array $a, array $b)
    {
        foreach ($b as $key => $value) {
            if (array_key_exists($key, $a)) {
                if (is_int($key)) {
                    $a[] = $value;
                } elseif (is_array($value) && is_array($a[$key])) {
                    $a[$key] = merge_old($a[$key], $value);
                } else {
                    $a[$key] = $value;
                }
            } else {
                $a[$key] = $value;
            }
        }

        return $a;
    }

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [foo] => xyz [] => Array ( [0] => abc [1] => xyz ) [bar] => baz ) Fatal error: Uncaught Error: Call to undefined function print_() in /in/dQ9iU:8 Stack trace: #0 {main} thrown in /in/dQ9iU on line 8
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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