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<?php $input = '((800 + 20) - 800 / 2); `whoami`'; $tokens = token_get_all("<?php {$input}"); $expr = ''; foreach($tokens as $token){ if(is_string($token)){ if(in_array($token, array('(', ')', '+', '-', '/', '*'), true)) $expr .= $token; continue; } list($id, $text) = $token; if(in_array($id, array(T_DNUMBER, T_LNUMBER))) $expr .= $text; } $result = eval("return ({$input});"); print "\nexpr = " . $expr; print "\nres = " . $result;
Output for git.master, git.master_jit, rfc.property-hooks
Parse error: syntax error, unexpected token ";" in /in/hpc6U(25) : eval()'d code on line 1
Process exited with code 255.

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