How to run JavaScript code in PHP

PHP
1

Hello everyone,
The following HTML/JavaScript code inserts a background imag to a div without causing problems.

<!DOCTYPE html>
<html lang = "en">
<head>
  <title>to-forum.html</title>
  <script>
    function ChangeImage(param)
    { 
      return("http://localhost/images/greensilver.gif");
    }
  </script>
</head>
<body>
  <div id="logo" style = "height:400px; width:400px";> 
    <script>
      var xyz = ChangeImage();
      document.getElementById("logo").style.backgroundImage = "url('" + xyz + "')";
    </script>
  </div>
</body>
</html>

I need to run that JS script from a PHP code so I wrote:

<!DOCTYPE html>
<html lang = "en">
<head>
  <script>
    function ChangeImage(param)
    { 
      return("http://localhost/tlushim/images/greensilver.gif");
    }
  </script>
</head>
<body>
  <div id="logo" style = "height:400px; width:400px";> 
    <?php
      echo '<script>',
      'var xyz = ChangeImage"('" + 1 + "')";',
      'document.getElementById"('" + logo +"')".style.backgroundImage = "url('" + xyz + "')";',
      '</script>'
    ?>
  </div>
</body>
</html>

With the second code I was less lucky/ This time the desired background image didn’t show up, probably, because
I dont know how to run JS code from PHP.
Could anyone help me with that please?
Thanks

2

The quotes in this part

      echo '<script>',
      'var xyz = ChangeImage"('" + 1 + "')";',
      'document.getElementById"('" + logo +"')".style.backgroundImage = "url('" + xyz + "')";',
      '</script>'

don’t work correctly for PHP. You use single-quotes for the echo statement, but you close the second output string (just after the open-bracket after ChangeImage) and then immediately stick a double-quote in. I’m surprised you don’t get a parse error.

3

Basically you need to understand Javascript runs on the client side, and PHP runs or executes in the server side. If you want to put javascript code in a php file, remember you can write as you write html code inside php. You just follow the structure of an HTML file when you write a php file that returns a webpage. Just remember you are using php engine, so php is the main code to be executed on the server, so whatever inside php tags <?php ?> the server will execute that. I don’t know, maybe you want to made some tricks using php to control content of javascript, in that case

4

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