Create Dynamic fileupload api in php


I am working on file upload api in php. For Now I just create this simple php which will upload the file from an html page to server. But in this code the fileupload control's name is fixed so I pass that name in my php code for upload the file. But I want to create this api for third party. If anybody ask for api then I will give link of my api and they will consume it. Now anybody please help me to convert this into dynamic

Here is the html code


 <h2>Upload Image </h2>
<form action="" method="POST" enctype="multipart/form-data" >
<input type="file" name="filename" value="" />
<br />
<input type="submit" value="Upload File"  />



and here is my php code for api.php


// Path to move uploaded files
$target_path = 'images/';

$response = array();

$file_upload_url = $target_path;
$filename = $_POST['filename']; 
 if (isset($_FILES['filename']['name'])) 
    $target_path = $target_path . basename($_FILES['filename']['name']);
    // reading other post parameters
    echo $_FILES['filename']['name']."<br />";
    echo $_FILES['filename']['tmp_name']."<br />";

    $response['file_name'] = basename($_FILES['filename']['name']);

        // Throws exception incase file is not being moved
        if (!move_uploaded_file($_FILES['filename']['tmp_name'], $target_path)) 
            // make error flag true
            $response['error'] = true;
            $response['message'] = 'Could not move the file!';

        // File successfully uploaded
         //echo $file_upload_url . basename($_FILES['filename']['name']);
        $response['message'] = 'File uploaded successfully!';
        $response['error'] = false;
        $response['file_path'] = $file_upload_url . basename($_FILES['filename']['name']);
    catch (Exception $e) 
        // Exception occurred. Make error flag true
        $response['error'] = true;
        $response['message'] = $e->getMessage();
    // File parameter is missing
 /*    $response['error'] = true;
    $response['message'] = 'Not received any file';
} */

// Echo final json response to client

 json_encode($response, JSON_UNESCAPED_SLASHES);

here is the api link

Please help me to make this api dynamic




A simple solution can be, add a hidden field which have name of file field like:

<input type="hidden" name="fileFieldName" value="filename" />

and on server side:

$fileFieldName = $_POST['fileFieldName'];

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