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run code in 200+ php & hhvm versions
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<?php $output = `free -mh`; echo "<pre>$output</pre>"; ?>
based on 0UE28
Output for 5.6.28, 7.0.20 - 7.2.0
<pre></pre>
Output for 5.4.0 - 5.6.25, 7.0.0 - 7.0.10
Warning: shell_exec(): Unable to execute 'free -mh' in /in/IC11O on line 2 <pre></pre>