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@ 2014-07-04T15:53:56Z

<?php
function mergeArray(array $arr1, array $arr2) {
    $keysStats = array();

    foreach ($arr1 as $index => $key) {
		$keysStats[$key] = array(
        	'arr1' => $index,
            'arr2' => null
        );
    }

    foreach ($arr1 as $index => $key) {
        if (!is_array($keysStats[$key])) {
            $keysStats[$key] = array(
                'arr1' => null,
                'arr2' => $index
            );
        } else {
			$keysStats[$key]['arr2'] = $index;
        }
    }

    $allKeys = array_keys($keyStats);
    sort($allKeys);
    $merged = array();

    foreach ($allKeys as $key) {
        if (is_null($keysStats[$key]['arr2'])) {
            $merged[] = null;
        } else {
            $merged[] = $arr2[$keysStats[$key]['arr2']];
        }
    }

    return $arrMerged;
}

print_r(mergeArray(
    array(
        'a', 'b', 'c', 'd', 'e', 'f', 'g'
    ),
    array(
        'a', 'b', 'z', 'q'
    )
));

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined variable $keyStats in /in/nYfJb on line 23 Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /in/nYfJb:23 Stack trace: #0 /in/nYfJb(23): array_keys(NULL) #1 /in/nYfJb(38): mergeArray(Array, Array) #2 {main} thrown in /in/nYfJb on line 23
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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