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run code in 150+ php & hhvm versions
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$rate = 15 <?php if($rate[0]) { ?> <?php echo $rate[0]; ?> <?php } ?>
based on SlGK7
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
$rate = 15 Notice: Undefined variable: rate in /in/b2P6K on line 4
Output for 4.3.0 - 5.0.3
$rate = 15 Notice: Undefined variable: rate in /in/b2P6K on line 4