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run code in 200+ php & hhvm versions
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<?php $max = 0; $output = null; for ($i = 100; $i < 10000; $i++ ) { for ($j = 100; $j < 10000; $j++) { $mul = $i*$j; if ($mul == strrev($mul) && $mul > $max) { $max = $mul; } } } echo "$max\n";
Output for 5.3.11 - 7.2.0

Process exited with code 137.