Php function fopen()

The Php function fopen() is used to open files for reading, writing, or both.
It provides a way to access files, which can be necessary for various operations like reading file contents,
writing data to files, or appending data to existing files.
Here are some common use cases and reasons for using fopen():

  1. Reading Files: You can open a file for reading its contents. This is useful for processing data stored in text files, logs, or configuration files.
  2. Writing to Files: You can open a file for writing, which is useful for saving data, creating log files, or generating reports.
  3. Appending Data: You can open a file to append data to the end without overwriting the existing content.
  4. Binary File Handling: fopen() can also be used to handle binary files, such as images or executable files.
  5. File Handling Modes: fopen() supports different modes (e.g., read, write, append) to handle files as per the requirement.

a) ‘r’ – Read-only. Starts at the beginning of the file.
b) ‘w’ – Write-only. Opens and truncates the file; or creates a new file if it doesn’t exist.
c) ‘a’ – Write-only. Opens and writes to the end of the file or creates a new file if it doesn’t exist.
d) ‘r+’ – Read and write. Starts at the beginning of the file.
e) ‘w+’ – Read and write. Opens and truncates the file; or creates a new file if it doesn’t exist.
f) ‘a+’ – Read and write. Opens and writes to the end of the file or creates a new file if it doesn’t exist.

Example for Read-only:-

$filename = “example.txt”;
$file = fopen($filename, “r”);
fclose($file);

Example for Write-only :-

$filename = “example.txt”;
$file = fopen($filename, “w”);
fclose($file);

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