PHP processes TXT file of turns on and and closes and to check and read

php file processing: https: / / www ofstack. 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); 

?>