计算PHP / Javascript中接收的数据大小

Usingg the Ajax request i get content which is displayed on the web page.

The content can be only strings / string + html content / string + images.

I need to calculate the total size of the content and if it exceeds 200Kb, I do not have to show it on the HTML page.

How do i calculate the size of the content in either jQuery/Angualarjs/Javascript/PHP?

Modify your PHP backend:

ob_start();
// all content generated here ...
$output = ob_get_clean();
if ( strlen($output) > (200*1024) ) {
    //return error to frontend
} else {
    echo $output;
}

ob_start();
$output = ob_get_length();

or if you have to set the content-length param then add the following to above code:

header("Content-Length: $output");