I have three lines of code;

$image->saveAs('tmp/page.png');
$image = 'tmp/page.png';
unlink('tmp/page.png');

I would like to have a random filename for page.png, so I have chosen to use the following;

uniqid()

How would I go about using uniqid() within each of those three lines. So it appears as;

$image->saveAs('tmp/randomfilename.png');
$image = 'tmp/randomfilename.png';
unlink('tmp/randomfilename.png');

The full page code is;

<?php

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

?>

<?php

$loader = require __DIR__ . '/vendor/autoload.php';

?>

<?php

use mikehaertl\wkhtmlto\Image;

$image = new \mikehaertl\wkhtmlto\Image('https://www.google.co.uk/search?q=what+is+the+time&oq=what+is+the+time&aqs=chrome.0.69i59j0l5.1536j0j4&sourceid=chrome&ie=UTF-8');
$image->setOptions(array(
'binary' => '/usr/local/bin/wkhtmltoimage',
'type' => 'png'
));

$image->saveAs('tmp/page.png');

$image = 'tmp/page.png';
$imageData = base64_encode(file_get_contents($image));
echo '<img src="data:image/png;base64,'.$imageData.'">';

unlink('tmp/page.png');
die();

?>

The simplest solution could be to create a db table for your images (or files generally) first save a row in that file that has an auto increment id and then save it with that id