PHP File Handling

PHP File Handling Tutorial

PHP File Handling provides functions to create, open, read, write, append, and delete files. File handling is useful for storing data, logs, user input, or configuration without using a database.

Opening a File (`fopen`)

Modes in `fopen()`

Mode	Description
`r`	Read only (file must exist)
`w`	Write only (creates file or truncates existing file)
`a`	Append only (creates file if not exists)
`r+`	Read and write (file must exist)
`w+`	Read and write (creates or truncates file)
`a+`	Read and append (creates file if not exists)

Writing to a File (`fwrite`)

w mode overwrites existing content.

Appending to a File (`a` Mode)

Reading a File (`fread`)

Reading a File Line by Line (`fgets`)

Reading a File into an Array (`file()`)

Deleting a File (`unlink`)

Checking if a File Exists (`file_exists`)

File Upload Example

HTML Form:

PHP Script (upload.php):

<?php
if (isset($_FILES['myfile'])) {
$filename = $_FILES['myfile']['name'];
$tempname = $_FILES['myfile']['tmp_name'];
$folder = "uploads/" . $filename;

if (move_uploaded_file($tempname, $folder)) {
echo "File uploaded successfully.";
} else {
echo "Failed to upload file.";
}
}
?>

<?php

if (isset($_FILES['myfile'])) {

$filename = $_FILES['myfile']['name'];

$tempname = $_FILES['myfile']['tmp_name'];

$folder = "uploads/" . $filename;

if (move_uploaded_file($tempname, $folder)) {

echo "File uploaded successfully.";

} else {

echo "Failed to upload file.";

}

Summary

Use fopen(), fread(), fwrite(), fclose() for basic file operations.
a mode appends data; w mode overwrites.
file() reads file into array; fgets() reads line by line.
Always check with file_exists() before reading or deleting.
unlink() deletes a file.
File upload requires enctype="multipart/form-data" in the form.

PHP File Handling