CSV file Read class

classCsvreader {Private $csv _file; Private $SPL _object=NULL; Private $error;  Public function__construct ($csv _file= ' ') {        if($csv _file&&file_exists($csv _file)) {            $this->csv_file =$csv _file; }    }     Public functionSet_csv_file ($csv _file) {        if(!$csv _file|| !file_exists($csv _file)) {            $this->error = ' File invalid '; return false; }        $this->csv_file =$csv _file; $this->spl_object =NULL; }     Public functionGet_csv_file () {return $this-Csv_file; }    Private function_file_valid ($file= ' ') {        $file=$file?$file:$this-Csv_file; if(!$file|| !file_exists($file)) {            return false; }        if(!is_readable($file)) {            return false; }        return true; }    Private function_open_file () {if(!$this-_file_valid ()) {            $this->error = ' File invalid '; return false; }        if($this->spl_object = =NULL) {            $this->spl_object =NewSplfileobject ($this->csv_file, ' RB '); }        return true; }     Public functionGet_data ($length= 0,$start= 0) {        if(!$this-_open_file ()) {            return false; }        $length=$length?$length:$this-Get_lines (); $start=$start-1; $start= ($start< 0)? 0:$start; $data=Array(); $this->spl_object->seek ($start);  while($length--&&!$this->spl_object->EOF ()) {            $data[] =$this->spl_object->Fgetcsv(); $this->spl_object->Next(); }        return $data; }     Public functionGet_lines () {if(!$this-_open_file ()) {            return false; }        $this->spl_object->seek (filesize($this-csv_file)); return $this->spl_object->Key(); }     Public functionGet_error () {return $this-error; }}

CSV file Read class