Ví dụ về File_exists, Fopen, Fwrite, Fclose, Fgets, copy, unlink trong PHP

            <?php
  file_exists($filename); 
?>
        

            <?php
if (file_exists('my_settings.txt'))
  {    
    echo 'file found!';
  } 
  else
  {     
    echo 'my_settings.txt does not exist';
  } 
?>
        

            <?php
  fopen($file_name,$mode,$use_include_path,$context);
?>
        

            <?php
  fwrite($handle, $string, $length);
?>
        

            <?php 
  // Mở một file cho phép Ghi
  $myfile = fopen("gfg.txt", "w"); 
  
  // Ghi một chuỗi vào file sử dụng hàm fwrite
  echo fwrite($myfile, "Đây là chuỗi vừa được ghi vào file"); 
  
  // Đóng file lại
  fclose($myfile);
  // Kết quả là gì?
?>
        

            <?php
  fclose($handle); 
?>
        

            <?php

// Mở một file

$fh = fopen("my_settings.txt", 'w')

or

die("Failed to create file");

?>
        

            <?php

// Đóng file
fclose($fh);

?>
        

            <?php 

$fh = fopen("my_settings.txt", 'w') or die("Failed to create file"); 

$text = <<<_END 

localhost;root;pwd1234;my_database 

_END; 

fwrite($fh, $text) or die("Could not write to file"); 

fclose($fh); 

echo "File 'my_settings.txt' written successfully";
?>
        

            <?php
  fgets($handle);
?>
        

            <?php
  $fh = fopen("my_settings.txt", 'r') or die("File does not exist or you lack permission to open it");
  $line = fgets($fh);
  echo $line; fclose($fh);
?>
        

            <?php
  copy($file,$copied_file);
?>
        

            <?php
  copy('my_settings.txt', 'my_settings_backup.txt') or die("Could not copy 
file");
  echo "File successfully copied to 'my_settings_backup.txt'"; 
?>
        

            <?php
  if (!unlink('my_settings_backup.txt'))
  {
    echo "Could not delete file";
  }
  else
  {
    echo "File 'my_settings_backup.txt' successfully deleted"; 
  }
?>
        

            <?php
  echo "<pre>"; // Enables display of line feeds
  echo file_get_contents("my_settings.txt");
  echo "</pre>"; // Terminates pre tag
?>