Basic operations on php files

Basic operations on php files

// Basic file operations // Fopen () Open a file // Open a file in the absolute path, select read-only mode, and return the resource $ handle $ Handle = fopen ("D:/lamp/apache2/htdocs/test/file.txt", "r "); // Access the file in the root directory of the document and select the read-only mode $ Handle = fopen ($ _ SERVER ['document _ root']. "/test/file.txt", "r "); // Open a remote file. the http protocol can only be opened in read mode. $ Handle = fopen ("http://www.wowsai.com", "r "); // Use the FTP protocol to open a remote file. if the FTP server is writable, it can be opened in write mode. // $ Handle = fopen ("ftp: // user: password@example.com/file.txt", 'w '); // Fclose () Disable open resource type // Fwrite () Write content to the file $ FileName = "data.txt "; // Declare the variable of a file // Open the file in write-only mode. If no file exists, create the file and use the program when opening fails. $ F_handle = fopen ("data.txt", "w") or die ("Open". $ FileName ."File failed "); For ($ I = 0; $ I <10; $ I ++ ){ // Add content to the file through a loop Fwrite ($ f_handle, "again \ n "); } Fclose ($ f_handle ); // Close the opened file // File_put_contents () Write all data to the specified file at a time // Read the file content // Fread () Read open files // File_get_contents () Read a file into a string // Fgets () Returns a row from an opened file. // Fgetc () Returns characters from an opened file. // File () Read the file into an array. // Readfile () Reads a file and outputs it to the output buffer. // Feof () Determines whether a file pointer is located at the end of the file. // Read the specified number of bytes from the file and save it to a variable. $ FileName2 = "data.txt "; $ F_hand = fopen ($ fileName2, "r") or die ("file opening failed "); $ Contents = fread ($ f_hand, 50 ); Fclose ($ f_hand ); Echo $ contents ." "; // Read all the content from the file and store it into a variable. each time you read a part, read it cyclically. /* $ FileName3 = "D:/lamp/apache2/icons/link.gif "; // Save the file name of the binary file to a variable $ F3_handle = fopen ($ fileName3, "rb") or die ("file opening failed"); // open the file in read-only mode, and add "B" $ F3_contents = ""; // Declare a string used to save the file content While (! Feof ($ f3_handle )){ // Read the content of the file cyclically and know the end of the file $ F3_contents. = fread ($ f3_handle, 1024 ); // Read 1024 characters each time } Fclose ($ f3_handle ); Echo $ f3_contents ;*/ // Another method for reading all the content of a file $ FileName4 = "data.txt "; $ F4_handle = fopen ($ fileName4, "r") or die ("file opening failed "); $ F4_con = fread ($ f4_handle, filesize ($ fileName4 )); // Use filesize to get the object length, so as to read all the object content Fclose ($ f4_handle ); Echo $ f4_con ." "; // Another method is to read all the content of a file, which is much better than the above method. Echo file_get_contents ("data.txt "); $ F5_handle = fopen ("data.txt", "r") or die ("file opening failed "); While (! Feof ($ f5_handle )){ // Determine whether the pointer ends with the end of the file $ Buffer = fgets ($ f5_handle ); // Read a row from the file each time Echo $ buffer ." "; } Fclose ($ f5_handle ); $ F6_handle = fopen ("data.txt", "r") or die ("file opening failed "); While (! Feof ($ f6_handle )){ // Determine whether the pointer ends with the end of the file $ Buffer = fgetc ($ f6_handle ); // Read one character from the object each time Echo $ buffer ." "; } Fclose ($ f6_handle ); Print_r (file ("data.txt ")); // Read the file into an array Readfile ("data.txt "); // Read the content of the file and output it to the browser. // Access a remote file Make sure that "allow_url_fopen" in php. ini is enabled and that the remote file has access permissions. $ Ws_file = fopen ("http://www.wowsai.com", "r") or die ("remote file opening failed "); // Open a remote file While (! Feof ($ ws_file )){ $ Ws_line = fgets ($ ws_file ); If (preg_match ("/(. *) <\/Title>/", $ ws_line, $ res )){ // Use the regular expression to match the website title $ Title = $ res [1]; Break; } } Fclose ($ ws_file ); Echo $ title ." "; // Move the object pointer // Ftell () Returns the current position of the pointer. // Fseek () Move the pointer to the specified position // Rewind () Move the pointer to the beginning of the file $ Fp = fopen ("data.txt", "r") or die ("file opening failed "); // Open the file in read-only mode Echo ftell ($ fp )." "; // Output the pointer position when the file is opened. the default value is 0. Echo fread ($ fp, 10 )." "; // Read the first 10 characters of the file, and the file pointer has changed. Echo ftell ($ fp )." "; // After reading the file with 10 characters, the pointer of the file reaches the 10 position Fseek ($ fp, 30, SEEK_CUR ); // Move the object pointer 30 characters backward Echo ftell ($ fp )." "; // 30 characters after the file is moved, it reaches the position of 40. Echo fread ($ fp, 10 )." "; // Read the characters between 40 and 50, and the pointer will reach 50 Fseek ($ fp,-10, SEEK_END ); // Set the pointer to the last 10th position of the file Echo fread ($ fp, 10 )." "; // Output the last 10 characters of the file Rewind ($ fp ); // Set the file pointer to the beginning of the file Echo ftell ($ fp ); // The pointer of the file returns to the beginning, so 0 is output. Fclose ($ fp ); ?>

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