PHP some well-packaged functions for files

<?PHP//Bytes/kb/mb/gb/tb/eb/** * Convert byte size * @param number $size * @return number*/functionTransbyte ($size) {    $arr=Array("B", "KB", "MB", "GB", "TB", "EB" ); $i= 0;  while($size>= 1024 ) {        $size/= 1024; $i++; }    return round($size, 2).$arr[$i];}/** * Create file * @param string $filename * @return String*/functionCreateFile ($filename) {    //file/1.txt//Verify the legality of the file name, whether it contains/,*,<>,?, |    $pattern= "/[\/,\*,<>,\?\|] /"; if(!Preg_match($pattern,basename($filename ) )) {        //detects if a file with the same name exists in the current directory        if(!file_exists($filename )) {            //using Touch ($filename) to create            if(Touch($filename )) {                return"File creation succeeded"; } Else {                return"File creation failed"; }        } Else {            return"File already exists, please rename and create"; }    } Else {        return"Illegal file name"; }}/** * Rename file * @param string $oldname * @param string $newname * @return String*/functionRenameFile ($oldname,$newname){//echo $oldname, $newname;//Verify file name is legal    if(Checkfilename ($newname)){        //detects if a file with the same name exists in the current directory        $path=dirname($oldname); if(!file_exists($path." /".$newname)){            //to Rename            if(Rename($oldname,$path." /".$newname)){                return"Rename succeeded"; }Else{                return"Renaming failed"; }        }Else{            return"There is a file with the same name, please rename"; }    }Else{        return"Illegal file name"; }    }/** * Check if file name is valid * @param string $filename * @return Boolean*/functionCheckfilename ($filename){    $pattern= "/[\/,\*,<>,\?\|] /"; if(Preg_match($pattern,$filename )) {        return false; }Else{        return true; }}/** * Delete file * @param string $filename * @return String*/functionDelfile ($filename){    if(unlink($filename)){        $mes= "File deletion succeeded"; }Else{        $mes= "File deletion failed"; }    return $mes;}/** * Download file operation * @param string $filename*/functionDownfile ($filename){    Header("Content-disposition:attachment;filename=".basename($filename)); Header("Content-length:".)filesize($filename)); ReadFile($filename);}/** * Copy file * @param string $filename * @param string $dstname * @return String*/functionCopyFile ($filename,$dstname){    if(file_exists($dstname)){        if(!file_exists($dstname." /".basename($filename))){            if(Copy($filename,$dstname." /".basename($filename))){                $mes= "File copy succeeded"; }Else{                $mes= "File copy Failed"; }        }Else{            $mes= "file with the same name exists"; }    }Else{        $mes= "Destination directory does not exist"; }    return $mes;}functionCutfile ($filename,$dstname){    if(file_exists($dstname)){        if(!file_exists($dstname." /".basename($filename))){            if(Rename($filename,$dstname." /".basename($filename))){                $mes= "File Cut succeeded"; }Else{                $mes= "File cut Failed"; }        }Else{            $mes= "file with the same name exists"; }    }Else{        $mes= "Destination directory does not exist"; }    return $mes;}/** * Upload file * @param array $fileInfo * @param string $path * @param array $allowExt * @param int $maxSize * @return Strin G*/functionUploadFile ($fileInfo,$path,$allowExt=Array("GIF", "JPEG", "JPG", "png", "TXT"),$maxSize=10485760){    //Judging the error number    if($fileInfo[' Error ']==UPLOAD_ERR_OK) {        //whether the file was uploaded via the HTTP POST method        if(Is_uploaded_file($fileInfo[' Tmp_name '])){            //upload file name, only allow upload jpeg|jpg, PNG, GIF, TXT file//$allowExt =array ("gif", "JPEG", "JPG", "png", "TXT");            $ext=getext ($fileInfo[' Name ']); $uniqid=Getuniqidname (); $destination=$path." /".PathInfo($fileInfo[' Name '],pathinfo_filename). " _".$uniqid.".".$ext; if(In_array($ext,$allowExt)){                if($fileInfo[' Size ']<=$maxSize){                    if(Move_uploaded_file($fileInfo[' Tmp_name '],$destination)){                        $mes= "File Upload succeeded"; }Else{                        $mes= "File move Failed"; }                }Else{                    $mes= "File Too large"; }            }Else{                $mes= "Illegal file type"; }        }Else{            $mes= "file is not uploaded via HTTP POST"; }    }Else{        Switch($fileInfo[' Error ']){             Case1:$mes= "The size of the configuration file is exceeded";  Break;  Case2:$mes= "exceeds the size of the form allowed to receive data";  Break;  Case3:$mes= "File part is uploaded";  Break;  Case4:$mes= "No files are uploaded";  Break; }    }        return $mes; }

PHP some well-packaged functions for files