


Upload a File Using PHP
Uploading files to a specified folder is a common task in many web applications. This question explores a simple PHP code block aimed at achieving this task.
$folder = "upload/"; if (is_uploaded_file($HTTP_POST_FILES['filename']['tmp_name'])) { if (move_uploaded_file($HTTP_POST_FILES['filename']['tmp_name'], $folder . $HTTP_POST_FILES['filename']['name'])) { echo "File uploaded"; } else { echo "File not moved to destination folder. Check permissions"; }; } else {s echo "File is not uploaded"; };
However, upon execution, an error occurs:
Notice: Undefined variable: HTTP_POST_FILES in C:\wamp\www\sdg\import\ips.php on line 3
Solution:
The error is caused by using the deprecated variable $HTTP_POST_FILES. Instead, use $_FILES:
$folder = "upload/"; if (is_uploaded_file($_FILES['filename']['tmp_name'])) { if (move_uploaded_file($_FILES['filename']['tmp_name'], $folder . $_FILES['filename']['name'])) { echo "File uploaded"; } else { echo "File not moved to destination folder. Check permissions"; }; } else {s echo "File is not uploaded"; };
Enhanced PHP Code:
The following enhanced PHP code offers improved features, including type checking and file size validation:
$target_dir = "upload/"; $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]); $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION)); $allowedTypes = ['jpg', 'png']; if (isset($_POST["submit"])) { // Check file type if (!in_array($imageFileType, $allowedTypes)) { $msg = "Type is not allowed"; } // Check if file exists elseif (file_exists($target_file)) { $msg = "Sorry, file already exists."; } // Check file size elseif ($_FILES["fileToUpload"]["size"] > 5000000) { $msg = "Sorry, your file is too large."; } // Move file elseif (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) { $msg = "The file " . basename($_FILES["fileToUpload"]["name"]) . " has been uploaded."; } } ?>
HTML Code:
The above is the detailed content of How to Correctly Upload Files in PHP and Handle Potential Errors?. For more information, please follow other related articles on the PHP Chinese website!

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