Are there any security concerns to consider when fetching and displaying external content on a webpage using PHP?

When fetching and displaying external content on a webpage using PHP, there are security concerns to consider, such as Cross-Site Scripting (XSS) attacks. To mitigate this risk, it is important to properly sanitize and validate the external content before displaying it on the webpage. This can be done by using functions like `htmlspecialchars()` to escape special characters and prevent script injection. 

// Fetch external content
$external_content = file_get_contents('http://example.com/external_content');

// Sanitize and display the external content
echo htmlspecialchars($external_content);

Keywords

Cross-site scripting Content Security Policy PHP cURL Input validation SQL injection

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