How can PHP scripts be adapted to function properly on websites with HTTPS protocols?

PHP scripts can be adapted to function properly on websites with HTTPS protocols by ensuring that all URLs within the script are using the secure HTTPS protocol. This can be achieved by updating any HTTP URLs to HTTPS URLs or by using PHP's built-in functions like `$_SERVER['HTTPS']` to check if the current request is using HTTPS. Additionally, setting the `$_SERVER['HTTPS']` variable to 'on' when the request is using HTTPS can help ensure that the script functions correctly. 

// Check if the request is using HTTPS
if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on'){
    // Use HTTPS protocol for URLs
    $url = 'https://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
}else{
    // Redirect to HTTPS if not already using it
    header("Location: https://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']);
    exit();
}

Keywords

SSL HTTPS cURL SSL certificate secure connection

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