How can PHP be used to validate and sanitize text files before displaying them to users?

To validate and sanitize text files before displaying them to users in PHP, you can use functions like `file_get_contents()` to read the file, `htmlspecialchars()` to sanitize the content, and regular expressions or built-in PHP functions to validate the text against certain criteria. 

$file = 'example.txt';
$content = file_get_contents($file);

if (preg_match('/^[a-zA-Z0-9\s]+$/', $content)) {
    $sanitized_content = htmlspecialchars($content);
    echo $sanitized_content;
} else {
    echo 'Invalid content.';
}

Keywords

PHP validation sanitization text files security

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