PHP 处理TXT文件(打开/关闭/检查/读取)

<?php
$filename=dirname(__FILE__)."/readfrom.txt";
$ofilename=dirname(__FILE__)."/writeto.txt";

if(!file_exists($filename)){
echo $filename." not found!";
exit;
}

$fp=fopen($filename,"r");
$fo = fopen($ofilename,"w");

while(!feof($fp)){

$record=fgets($fp);

if($record!=NULL){
$record_arr=explode("\t", $record);

fwrite($fo,$record,strlen($col));
}


}
fclose($fo);
fclose($fp);

?>