<?php $formula = '[ (((-594 - 0) )/ 55032411) *244 ]'; $pos = strpos($formula, "-"); $part = str_replace(array("(",")","["," "), array("","","",""),substr($formula, 0, $pos)); If($part ==""){ $formula = substr($formula, 0,$pos) ."0". substr($formula, $pos); } Echo $formula;
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