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@ 2014-04-05T07:53:14Z

<?php

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

$a = 0;
debug_zval_dump($a);
test($a);
debug_zval_dump($a);

Output
Performance
VLD
References
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debug_zval_dump: documentation ( source)

preferences:dark modelive preview

33.29 ms | 402 KiB | 5 Q