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run code in 200+ php & hhvm versions
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<?php $b = "a.txt; rm -rf * #"; echo(exec("avconv -i /var/www/html/upload/" . $b . " /var/www/html/upload/")); ?>
based on NYfTA
Output for 4.3.0, 5.4.39 - 7.2.0
Output for 4.3.1 - 5.4.38
sh: 1: avconv: not found sh: 1: rm: not found