$fp = fopen(“$document_root/../orders/orders.txt”, ‘w’);
When fopen() is called, it expects two, three, or four parameters. Usually, you use two
Table of files mode of fopen()
| Mode | Mode Name | Meaning |
|---|---|---|
| r | Read | Open the file for reading, beginning from the start of the file. |
| r+ | Read | Open the file for reading and writing, beginning from the start of the file |
| w | Write | Open the file for writing, beginning from the start of the file. If the file already exists, delete the existing contents. If it does not exist, try to create it. |
| w+ | Write | Open the file for writing and reading, beginning from the start of the file. If the file already exists, delete the existing contents. If it does not exist, try to create it |
| x | Cautious write | Open the file for writing, beginning from the start of the file. If the file already exists, it will not be opened, fopen() will return false, and PHP will generate a warning |
| x+ | Cautious write | Open the file for writing and reading, beginning from the start of the file. If the file already exists, it will not be opened, fopen() will return false, and PHP will generate a warning |
| a | Append | Open the file for appending (writing) only, starting from the end of the existing contents, if any. If it does not exist, try to create it. |
| a+ | Append | Open the file for appending (writing) and reading, starting from the end of the existing contents, if any. If it does not exist, try to create it. |
| b | Binary | Used in conjunction with one of the other modes. You might want to use this mode if your file system differentiates between binary and text files. Windows systems differentiate; Unix systems do not. The PHP developers recommend you always use this option for maximum portability. It is the default mode |
| t | Text | Used in conjunction with one of the other modes. This mode is an option only in Windows systems. It is not recommended except before you have ported your code to work with the b option. |