PHP 处理TXT文件(打开/关闭/检查/读取)

php文件处理：https://3water.com/w3school/php/php_file.htm

<?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); 
?>