What are some best practices for handling data output in PHP to ensure proper functionality?

When handling data output in PHP, it is important to properly sanitize and validate the data to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. One best practice is to use PHP's built-in functions like htmlentities() or htmlspecialchars() to escape output data before displaying it to the user. Additionally, it is recommended to set proper content headers and encoding to ensure that the output is correctly interpreted by the browser. 

// Example of sanitizing and outputting data in PHP
$data = "<script>alert('Hello, world!');</script>";
$escaped_data = htmlspecialchars($data, ENT_QUOTES, 'UTF-8');
echo $escaped_data;

Keywords

data output PHP security sanitization validation

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