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@ 2015-11-30T08:33:31Z

<?php

$a='26.15';
$b='0.00';
if ($a && $b) {
     $discount = round($promotion_temp * 10 / $price_temp, 2);
     
    echo $discount;
}else{
    echo 'fail';
}

Output
Performance
VLD
References
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round: documentation ( source)

preferences:dark modelive preview

41.74 ms | 402 KiB | 5 Q