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@ 2014-04-29T15:07:26Z

<?php
$arr = array(1,"","1","    ",NULL);
for($i=0;$i<5;$i++)
echo var_dump(isset($arr[$i]))." >> ";

echo var_dump(isset($adf));

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

31.29 ms | 402 KiB | 5 Q