LERAN PHP COMPLETE

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PHP File Uploading


With PHP, it is easy to upload files to the server.

However, with ease comes danger, so always be careful when allowing file uploads!


Configure The "php.ini" File

First, ensure that PHP is configured to allow file uploads.

In your "php.ini" file, search for the file_uploads directive, and set it to On:

file_uploads = On

Create The HTML Form

<!DOCTYPE html>
    <html>
        <body>
            <form action="upload.php" method="post" enctype="multipart/form-data">
                Select image to upload:
                <input type="file" name="fileToUpload" id="fileToUpload">
                <input type="submit" value="Upload Image" name="submit">
            </form>
        </body>
    </html>

  • Make sure that the form uses method="post"
  • The form also needs the following attribute: enctype="multipart/form-data". It specifies which content-type to use when submitting the form

Create The Upload File PHP Script

<?php
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = 1;
    $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
    
    /* Check if image file is a actual image or fake image */
    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;
}

Limit File Size

if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}

Limit File Type

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

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