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@ 2012-05-11T10:10:17Z

<?php 
$var1 = ''; 
$var2 = $var3 = null; 

$var1--; 
$var2++; 
$var3++; 

var_dump($var1); 
var_dump($var2); 
var_dump($var3); 
?>

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

45.43 ms | 402 KiB | 5 Q