<?php $_POST['pulseCheck'] = "seven + four"; $_POST['solution'] = "12"; $lookup = array_flip( ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"] ); if (!preg_match('~^(10|\d) \+ (10|\d)$~', strtr($_POST['pulseCheck'], $lookup), $matches) || $matches[1] + $matches[2] != $_POST['solution'] ) { exit('Something went wrong'); }
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