PHP File Handling | asadmukhtar.info

PHP File Handling | asadmukhtar.info

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PHP File Handling

PHP allows you to create, read, write, append, and delete files using built-in functions.

Opening a File (fopen())

$file = fopen("example.txt", "r"); // Open file in read mode

✔ "r" → Read mode (file must exist).
✔ "w" → Write mode (creates/erases file).
✔ "a" → Append mode (adds content).

Reading a File (fread() & fgets())

$file = fopen("example.txt", "r");
$content = fread($file, filesize("example.txt")); 
echo $content;
fclose($file);

✔ Reads entire file content.

$file = fopen("example.txt", "r");
while (!feof($file)) {
    echo fgets($file); // Reads line by line
}
fclose($file);

✔ Reads line-by-line to handle large files.

Writing to a File (fwrite())

$file = fopen("example.txt", "w");
fwrite($file, "Hello, World!");
fclose($file);

✔ Overwrites content.
✔ Use "a" mode to append instead.

Deleting a File (unlink())

if (file_exists("example.txt")) {
    unlink("example.txt");
    echo "File deleted!";
}

✔ Removes a file permanently.

Checking File Existence (file_exists())

if (file_exists("example.txt")) {
    echo "File exists!";
}

✔ Avoids errors when accessing a file.

Conclusion

File handling in PHP allows reading/writing files.
✔ Always close files after use (fclose()).
✔ Use file_exists() to prevent errors.

Efficient file handling ensures better performance and security! 🚀