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把全角数字转为半角数字

<?php
function GetAlabNum($fnum) {
    $nums = array("0","1","2","3","4","5","6","7","8","9","+","-","%",".");
    $fnums = "0123456789+-%.";
    for ($i = 0; $i < count($nums); $i++) {
        if ($nums[$i] == $fnum) return $fnums[$i];
    }
    return $fnum;
}


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