<?php function convertToBytes($from){ $number=substr($from,0,-2); switch(strtoupper(substr($from,-2))){ case "KB": return $number*1024; case "MB": return $number*pow(1024,2); case "GB": return $number*pow(1024,3); case "TB": return $number*pow(1024,4); case "PB": return $number*pow(1024,5); default: return $from; } } echo convertToBytes("2 GB"); ?>
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