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@ 2017-04-05T06:50:30Z

<?php

$var1 = 444;
$var2 = 444;

$test = function() use(&$var1, &$var2){
    $var1       = $var1; // & not specified
    $var2_local = $var2; // & not specified
    
    $var1       = 333;
    $var2_local = 333;
};

$test();

var_dump($var1);
var_dump($var2);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

44.18 ms | 1543 KiB | 5 Q