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run code in 150+ php & hhvm versions
Bugs & Features
<?php $input = '((800 + 20) - 800 / 2)'; $tokens = token_get_all("<?php {$input}"); $expr = ''; foreach($tokens as $token){ if(is_string($token)){ if(in_array($token, array('(', ')', '+', '-', '/', '*'), true)) $expr .= $token; print "\n symbol: " . $expr; continue; } list($id, $text) = $token; if(in_array($id, array(T_DNUMBER, T_LNUMBER))){ $expr .= $text; print "\n number: " . $expr; } } eval("\$result = {$expr};"); print "\nexpr = " . $expr; print "\nres = " . $result;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
symbol: ( symbol: (( number: ((800 symbol: ((800+ number: ((800+20 symbol: ((800+20) symbol: ((800+20)- number: ((800+20)-800 symbol: ((800+20)-800/ number: ((800+20)-800/2 symbol: ((800+20)-800/2) expr = ((800+20)-800/2) res = 420