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Homephp教程php手册一个取得文件扩展名的函数_php基础

一个取得文件扩展名的函数
  
/*
GetFileType  
用法:GetFiletype($filename)
*/  

function GetFiletype($Filename) {  

    if (substr_count($Filename, ".") == 0) {        // 检查文件名中是否有.号。  

        return;                // 返回空

    } else if (substr($Filename, -1) == ".") {        // 检查是否以.结尾,即无扩展名  

        return;                // 返回空  

    } else {  
        $FileType = strrchr ($Filename, ".");    // 从.号处切割
        $FileType = substr($FileType, 1);    // 去除.号  
        return $FileType;            // 返回  
    }  
}  


$Filename = "Testfilename.php4";  

$Filename = GetFileType($Filename);  

echo $Filename;            //  打印出php4  

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