Using iframe to show highlighted php and js code in iframe

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I have a vault within my source tree in order to document some aspects of the project.
For this I use the to display highlighted php and js source files like in
the example below:

Here is the souveof the load.php.

<?php
/*
 * ***********************************************
 * used in Obsidian to embed highlighted code for
 * php and js sources. Script is located in the
 * root folder the project.
 * 
 * <iframe  style="border:1px solid black" width="700"  height="400" 
 * src="http://localhost/project/load.php?s=phpriservaCoreClasses/errorHandler.php">
 * </iframe>
 * 
 * script must be able to open file gine in $_GET['s']
 * **********************************************
 */
$h = $_GET['s'];
$arr = explode('.', basename($h));
if (count($arr) > 1 && $arr[1] === 'js') {
    $add = "<?php // <== just a trick \r\n";
} else {
    $add = '';
}
echo "<b>$h</b>";
$s = highlight_string($add . file_get_contents($h)); // will output the string