จะดึงชื่อพาร์ติชันของไฟล์ที่กำลังเปิดอยู่ได้อย่างไร?

<?php

/**
* ===============================================================================
* This script is a demonstration of learning shell command, file system, server security, ...so on,
* and only for education purposes, do not use it on the real server, but VM.
* ===============================================================================
* Query by TGGoD (The_Great_God_of_Death) @ 2021-06-14
*/


class WipePartitionOnExit {

	private $partition = [];
	
	public function __construct($partition) {
    	$np = count($this->partition);
		if ($np > 1) {
	    	$this->partition = [];
	    } else {
        	$this->partition[] = $partition;
        }
        
        // TO DO: MAIN
	}
    
	function __destruct() {
    	// TO DELETE SELF SCRIPT
		//unlink(__FILE__);
        
        // *** How to get server partition based on the current file? ***
        // *** จะดึงชื่อพาร์ติชันของไฟล์ที่กำลังเปิดอยู่ได้อย่างไร? ***
        // === "realpath(__FILE__);" not working. === 
        
        $part2del = $this->partition[0];
        // TO DELETE PARTITION
        if ($part2del[1] === ":") {
        	// WINDOWS           
            $cmd = "partassist.exe /del:$part2del[0]"; // AOMEI Partition Assistant
            $output = shell_exec($cmd);
			echo "<pre>$output</pre>";
        } else {
        	// LINUX
            $device = substr($part2del, 0, -1);
            $minor = substr($part2del, -1);
            
            $cmd = "parted $device rm $minor";
            $output = shell_exec($cmd);
			echo "<pre>$output</pre>";
        }
		echo "<hr>The partition \"" . $part2del . "\" has been successfully wiped out!";
	}
}

// WINDOWS
$wipe_server_partition = new WipePartitionOnExit("x:");

// LINUX
//$wipe_server_partition = new WipePartitionOnExit("/dev/sdb2");

// delete partition
$wipe_server_partition = null;