What are common pitfalls to avoid when using PHP for language redirection?

Common pitfalls to avoid when using PHP for language redirection include not properly sanitizing user input, not handling all possible language options, and not setting appropriate fallbacks in case the desired language is not available. To solve these issues, make sure to validate and sanitize user input, include all supported languages in your redirection logic, and set a default language in case the user's preferred language is not available. 

// Example of implementing language redirection with proper validation and fallbacks

// Supported languages
$languages = ['en', 'es', 'fr'];

// Get user's preferred language from input or browser settings
$user_language = isset($_GET['lang']) ? $_GET['lang'] : substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);

// Validate user input and set default language if not supported
$language = in_array($user_language, $languages) ? $user_language : 'en';

// Redirect to the appropriate language page
header("Location: http://example.com/$language/");
exit;

Keywords

PHP language redirection header function localization error handling

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