What is the main issue being faced with extracting user data from a string in PHP?

The main issue faced with extracting user data from a string in PHP is ensuring that the data is sanitized to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. One way to solve this issue is by using PHP's built-in functions like `filter_var()` or `htmlspecialchars()` to sanitize the input data before extracting it from the string. 

// Example of extracting user data from a string in PHP with sanitization
$userData = "<script>alert('Hello!');</script>";
$sanitizedData = htmlspecialchars($userData, ENT_QUOTES, 'UTF-8');
echo "Sanitized user data: " . $sanitizedData;

Keywords

Regular expressions preg_match explode substr string manipulation

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