Thanks. I'll try.

If you are wanting to change a target in a Cloud DB from Active to Inactive using PHP VWS, then you will need to set the 'active_flag' field to false in your JSON object that you send to the server. The UpdateTarget() method in the UpdateTarget.php example is the place to set the fields for the JSON request:

$this->jsonBody = json_encode( array( 'active_flag' => false ) );

The VWS API specifies which fields you can update for a specific target:

https://developer.vuforia.com/resources/dev-guide/updating-target-cloud-database

You can read more about the PHP json_encode method here:

http://php.net/manual/en/function.json-encode.php
 

Please anyone help on this question. 

I need to stop user to scan the particular images for the users. I've my own cloud db and it has support for different user using their own login system and the user reach the scan limit and i need to stop the recognize the target images of that users. How can i do that?

Please reply on this where should i add the code and which code should inactivate the target images in vuforia when i send request from my own server. It's a PHP sample code using.

I didn't understand this. I want to stop recognize the images when user scan. I've login system for different users and i want to stop only some images. Can we able stop the sending request to the vuforia database from my own website using VWS. 

The PHP and Java VWS sample apps may not follow the exact same code structure, so you have to look for where the JSON body is constructed. In the UpdateTarget.php file, you'll want to add your JSON body field options to the array seen in the highlighted line:

function UpdateTarget(){
    $this->requestPath = $this->requestPath . $this->targetId;
    $helloBase64 = base64_encode("hello world!");
    $this->jsonBody = json_encode( array( 'application_metadata' => $helloBase64 ) );
    $this->execUpdateTarget();
}

Where can i find this in PHP sample code? I looked at in updateTarget.PHP file but didn't get the line to inactivate the tracker image

You can use the VWS API to activate and inactivate targets in a Cloud DB:

https://developer.vuforia.com/resources/dev-guide/updating-target-cloud-database

Example from UpdateTarget.java VWS sample:

requestBody.put("active_flag", true); // Optional