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@ 2014-04-05T07:54:01Z

<?php

function test($var) 
{
    debug_zval_dump($a);
    $GLOBALS['a']++;
    echo $var;
}

$a = 0;
test($a);

Output
Performance
VLD
References
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debug_zval_dump: documentation ( source)

preferences:dark modelive preview

35.53 ms | 402 KiB | 5 Q