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run code in 500+ PHP versions simultaneously
<?php error_reporting(0); function f($s){for($i=-($l=strlen($s));$i<$l;$I=abs(++$i)){$t=substr($s,$I);echo str_repeat(' ',$I).strrev($t).substr($t,1)."\n";}} echo "------------\n"; f(" desserts"); echo "------------\n";
Output for rfc.property-hooks, git.master, git.master_jit
------------ stressed desserts s sts strts strerts streserts stressserts stressesserts stressedesserts stressed desserts stressedesserts stressesserts stressserts streserts strerts strts sts s ------------

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