What are the advantages and disadvantages of using iframes, meta refresh, and JavaScript for displaying dynamic content in PHP?

Issue: When displaying dynamic content in PHP, developers have the option to use iframes, meta refresh, or JavaScript. Each method has its own advantages and disadvantages, which should be considered before making a decision on which to use. Advantages and disadvantages of iframes: - Advantages: Easy to implement, can display content from external sources, and isolates the content from the rest of the page. - Disadvantages: May affect page loading speed, can cause security risks if content is from untrusted sources, and may not be responsive. Advantages and disadvantages of meta refresh: - Advantages: Simple to use, can automatically refresh content at specified intervals, and can be used for redirecting users to another page. - Disadvantages: Can be annoying for users if overused, may not be SEO-friendly, and can disrupt user experience. Advantages and disadvantages of JavaScript: - Advantages: Highly customizable, can create interactive and dynamic content, and can be used to fetch data asynchronously. - Disadvantages: Requires client-side processing, may not work if JavaScript is disabled, and can increase page load time. PHP code snippet using iframes:

<iframe src="dynamic_content.php"></iframe>
```

PHP code snippet using meta refresh:
```php
<meta http-equiv="refresh" content="5;url=dynamic_content.php">
```

PHP code snippet using JavaScript:
```php
<script>
  fetch('dynamic_content.php')
    .then(response => response.text())
    .then(data => document.getElementById('content').innerHTML = data)
    .catch(error => console.error('Error:', error));
</script>
<div id="content"></div>