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run code in 200+ php & hhvm versions
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<?php $i = 0; while($i<=10 ){ echo '<label for=""></label><select name="comp'. $i++ .'></select><br>'; }
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
<label for=""></label><select name="comp0></select><br><label for=""></label><select name="comp1></select><br><label for=""></label><select name="comp2></select><br><label for=""></label><select name="comp3></select><br><label for=""></label><select name="comp4></select><br><label for=""></label><select name="comp5></select><br><label for=""></label><select name="comp6></select><br><label for=""></label><select name="comp7></select><br><label for=""></label><select name="comp8></select><br><label for=""></label><select name="comp9></select><br><label for=""></label><select name="comp10></select><br>
Output for hhvm-3.12.14

Process exited with code 137.