Hear we following file-related functions will be explained in this chapter −
- Opening a text document
- Reading a text document
- Writing a text document
- Closing a text document
File Opening and Closing
To open a file, use the PHP fopen() function. The file name and the operating mode must be specified as the first two arguments.Fopen gives a false result in the event that an attempt to open a file is unsuccessful; otherwise, it produces a file pointer that can be used to continue reading or writing to the file.
It's crucial to use the fclose() method to close the opened file after making modifications. A file pointer is needed as an argument for the fclose() function, which returns true if the closure is successful and false otherwise.
Read a file
A file can be read using the fread() method once it has been opened using the fopen() function. Two arguments are needed for this function. These have to be the file path and the file size, stated in bytes.
The filesize() function, which accepts the file name as an input and returns the file's size expressed in bytes, can be used to determine the length of a file.
Thus, these are the actions needed to use PHP to read a file.
Use the fopen() function to open a file.
Use the filesize() function to find the length of the file.
Use the fread() method to read the contents of the file.
Use the fclose() method to end the file.
// Your File path
$filename = "example.txt";
// Check if the file exists
if (file_exists($filename)) {
// Open the file for reading
$file = fopen($filename, "r") or die("Unable to open file!");
// Read the file line by line
while (!feof($file)) {
echo fgets($file) . "<br>";
}
// Close the file
fclose($file);
} else {
echo "File not found!";
}Write a document
The PHP fwrite() method can be used to write a new file or append text to an already-existing file. Two inputs are needed for this function: the string of data to be written and a file pointer. The length of the data to write can optionally be specified using a third integer argument. Writing will end when the allotted length is achieved if the third argument is present.
The example that follows first creates a new text file and inserts a little text heading into it. The file_exist() method, which accepts the file name as an input, is used to verify the presence of this file after it has been closed.
Every function pertaining to file input and output in PHP files has been covered.
// Your File path
$filename = "example.txt";
// opening your file for write
$file = fopen($filename, "a") or die("Unable to open file!");
// Write to the file
$text = "This is a new line added to the file.\n";
fwrite($file, $text);
// Close the file
fclose($file);
// Read and display the updated file content
$file = fopen($filename, "r") or die("Unable to open file!");
while (!feof($file)) {
echo fgets($file) . "<br>";
}
fclose($file);It checks if a file named "example.txt" exists.
If the file exists, it opens it for reading, reads its contents line by line, and displays them.
It then opens the file in append mode and writes a new line to it.
Finally, it reads and displays the updated content of the file.
Make sure you have proper permissions to read from and write to files in your PHP environment. Also, remember to replace "example.txt" with the actual path to the file you want to read from or write to.
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