How can PHP sessions be utilized to prevent conflicts with multiple users uploading files simultaneously?

To prevent conflicts with multiple users uploading files simultaneously, PHP sessions can be utilized to store a unique identifier for each user's session. This identifier can be used to ensure that each user's file uploads are handled separately and do not interfere with each other. 

<?php
session_start();

// Generate a unique identifier for the user's session
$sessionId = session_id();

// Use the session identifier in the file upload process
$targetDir = "uploads/" . $sessionId . "/";
if (!file_exists($targetDir)) {
    mkdir($targetDir, 0777, true);
}

// Handle file upload using the unique session identifier
if ($_FILES["file"]["name"]) {
    $targetFile = $targetDir . basename($_FILES["file"]["name"]);
    move_uploaded_file($_FILES["file"]["tmp_name"], $targetFile);
    echo "File uploaded successfully.";
} else {
    echo "No file uploaded.";
}
?>

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