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@ 2014-09-28T15:17:00Z

<?php
	$User = array(
		'Name' => "Hans-Peterµµ",
		'Contacts' => array(1, 2, 3, 4, 5, 6, 7, 42),
		'Active' => 1
	);	foreach ($User as &$val) {
    $val = preg_replace_callback('/\\\\u([0-9a-f]{4})/i',
        function($matches) {
            return mb_convert_encoding(pack('H*', $matches[1]), 'UTF-8', 'UTF-16');
        }, $val);}
	$J = json_encode(array_utf8_encode($User));
	echo $J;


    
    function array_utf8_encode($Array)
    {        
        foreach($Array as &$Val)
        {            
            if(is_array($Val))
            {
                $Val = array_utf8_encode($Val);
                
            }
            
            elseif(is_string($Val))
            {
                $Val = mb_convert_encoding($Val, 'UTF-16');
                
            }
                
        }
        
        return $Array;
        
    }

Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Output for 5.4.0 - 5.4.45: {"Name":null,"Contacts":["\u00001","\u00002","\u00003","\u00004","\u00005","\u00006","\u00007","\u00004\u00002"],"Active":"\u00001"}

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