How do you handle file uploads in PHP

Handling file uploads in PHP involves using the `$_FILES` superglobal array. This allows you to manage files uploaded via an HTML form using the `POST` method. Below is a step-by-step guide along with an example:

Example of File Upload in PHP

First, create an HTML form to allow users to select a file from their device:


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

Next, handle the file upload in your PHP script (upload.php):


        <?php
        // Check if a file has been uploaded
        if(isset($_FILES['fileToUpload'])) {
            // Set a target directory
            $target_dir = "uploads/";
            $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
            $uploadOk = 1;

            // Check if the file is a real image
            $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
            if(isset($_POST["submit"])) {
                $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
                if($check !== false) {
                    echo "File is an image - " . $check["mime"] . ".";
                    $uploadOk = 1;
                } else {
                    echo "File is not an image.";
                    $uploadOk = 0;
                }
            }

            // Check if file already exists
            if (file_exists($target_file)) {
                echo "Sorry, file already exists.";
                $uploadOk = 0;
            }

            // Allow certain file formats
            if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
                && $imageFileType != "gif") {
                echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
                $uploadOk = 0;
            }

            // Check if $uploadOk is set to 0 by an error
            if ($uploadOk == 0) {
                echo "Sorry, your file was not uploaded.";
            // if everything is ok, try to upload file
            } else {
                if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
                    echo "The file ". htmlspecialchars(basename($_FILES["fileToUpload"]["name"])) . " has been uploaded.";
                } else {
                    echo "Sorry, there was an error uploading your file.";
                }
            }
        }
        ?>

How do you handle file uploads in PHP

Example of File Upload in PHP

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How do you handle file uploads in PHP

Example of File Upload in PHP

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