What are some best practices for sending files via a normal HTTP request in PHP and reading them on the receiving end with $_FILES?

When sending files via a normal HTTP request in PHP, it is important to use the correct enctype in the form (multipart/form-data) and have the receiving end handle the uploaded file using the $_FILES superglobal array. To ensure successful file transfer, make sure to check for errors, move the uploaded file to a designated directory, and handle any necessary validation or processing. 

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="Upload File">
</form>
```

```php
<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if ($_FILES['file']['error'] === UPLOAD_ERR_OK) {
        $uploadDir = 'uploads/';
        $uploadFile = $uploadDir . basename($_FILES['file']['name']);
        
        if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile)) {
            echo "File uploaded successfully.";
        } else {
            echo "Error uploading file.";
        }
    } else {
        echo "Error: " . $_FILES['file']['error'];
    }
}
?>

Keywords

file upload HTTP request $_FILES multipart/form-data move_uploaded_file

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