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PHP
Image Upload
The following code example illustrates how to handle image upload on your server using PHP as a server-side language. For step by step explanation of the upload flow see image upload concept.
Frontend
The main index page.
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <!-- Include external CSS. --> <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.4.0/css/font-awesome.min.css" rel="stylesheet" type="text/css" /> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.25.0/codemirror.min.css"> <!-- Include Editor style. --> <link href="https://cdn.jsdelivr.net/npm/[email protected]/css/froala_editor.pkgd.min.css" rel="stylesheet" type="text/css" /> <link href="https://cdn.jsdelivr.net/npm/[email protected]/css/froala_style.min.css" rel="stylesheet" type="text/css" /> </head> <body> <!-- Include external JS libs. --> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.25.0/codemirror.min.js"></script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.25.0/mode/xml/xml.min.js"></script> <!-- Include Editor JS files. --> <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]//js/froala_editor.pkgd.min.js"></script> <div class="sample"> <h2>File upload example.</h2> <form> <textarea id="edit" name="content"></textarea> </form> </div> <!-- Initialize the editor. --> <script> $(function() { $('#edit').froalaEditor({ // Set the file upload URL. imageUploadURL: '/upload_image.php', imageUploadParams: { id: 'my_editor' } }) }); </script> </body> </html>
Backend
upload_image.php file will do the upload part. It has basic image format validations this can be easily extended.
The uploads directory must be set to a valid location before any uploads are made. The path can be any folder that is accessible and write available.
After processing the uploaded image, if it passes the validation, the server will respond with a JSON object containing a link to the uploaded file.
E.g.: {"link":"http://server_address/uploads/name_of_file"}.
<?php
try {
// File Route.
$fileRoute = "/uploads/";
$fieldname = "file";
// Get filename.
$filename = explode(".", $_FILES[$fieldname]["name"]);
// Validate uploaded files.
// Do not use $_FILES["file"]["type"] as it can be easily forged.
$finfo = finfo_open(FILEINFO_MIME_TYPE);
// Get temp file name.
$tmpName = $_FILES[$fieldname]["tmp_name"];
// Get mime type.
$mimeType = finfo_file($finfo, $tmpName);
// Get extension. You must include fileinfo PHP extension.
$extension = end($filename);
// Allowed extensions.
$allowedExts = array("gif", "jpeg", "jpg", "png", "svg", "blob");
// Allowed mime types.
$allowedMimeTypes = array("image/gif", "image/jpeg", "image/pjpeg", "image/x-png", "image/png", "image/svg+xml");
// Validate image.
if (!in_array(strtolower($mimeType), $allowedMimeTypes) || !in_array(strtolower($extension), $allowedExts)) {
throw new \Exception("File does not meet the validation.");
}
// Generate new random name.
$name = sha1(microtime()) . "." . $extension;
$fullNamePath = dirname(__FILE__) . $fileRoute . $name;
// Check server protocol and load resources accordingly.
if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] != "off") {
$protocol = "https://";
} else {
$protocol = "http://";
}
// Save file in the uploads folder.
move_uploaded_file($tmpName, $fullNamePath);
// Generate response.
$response = new \StdClass;
$response->link = $protocol.$_SERVER["HTTP_HOST"].dirname($_SERVER["PHP_SELF"]).$fileRoute . $name;
// Send response.
echo stripslashes(json_encode($response));
} catch (Exception $e) {
// Send error response.
echo $e->getMessage();
http_response_code(404);
}
?>