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@ 2013-10-31T06:03:37Z

<?php 
function test(&$arr = array()) { 
    $GLOBALS['g_arr'] =& $arr;
    $arr[] = 1;
    var_dump($arr);
}
test();
var_dump($g_arr);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

38.77 ms | 402 KiB | 5 Q