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将“数字”安全读成只包含零(“0”)的档案?
原标题:Use of "is_numeric" to safely read file that only contains a zero ("0")?
  • 时间:2012-04-11 21:50:41
  •  标签:
  • php

在我的文件读写功能中,if($theData = @fread($fh,fileize($myFile),如果目标未包含任何零,则将退回不实,因此,我增加了对乱分类的检查(is_numeric)。 这是安全的吗?

function readfilecontents($myFile)
{
    if($fh = @fopen($myFile,  r ))
    {
        $theData = @fread($fh, filesize($myFile));
        if($theData || is_numeric($theData))
        {
            if(@fclose($fh))
            {
                return $theData;
            }
        }
    }
    return false;
}
最佳回答

无,这是不安全的——例如,如果你重读空洞档案,你的工作将退回不实,而不是空洞。 但是,没有必要像以下这样的职能:)。 确实如此(更快)。

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