Yea I know it's an old protocol but still...

Anyone figure out how to do it in PHP? Searching the forum turns up nothing xmodem related
What on Earth would you want to use PHP with XModem for?

Anyway, the specification is 3/4 of a page. https://web.mit.edu/6.115/www/amulet/xmodem.htm
I think the best solution will be just execute shell command to use any existing command line application fir xmodem. You can handle the response as you want in php, but it will be good only if you need some logic for that and you know only php. If logic isn't needed you can just write all commands in .bat file or learn another language that will be better for this purpose.
If you're referring to searching the PHP documentation using the PHP language itself, you can achieve it by making an HTTP request to the PHP documentation website and parsing the HTML response to extract the relevant information. Here's an example code snippet to get you started:
// Function to search for a PHP function and get its documentation URL
function searchPHPFunction($functionName) {
// Encode the function name for the URL
$encodedFunctionName = urlencode($functionName);

// Create the search URL
$searchUrl = "https://www.php.net/manual-lookup.php?pattern=$encodedFunctionName";

// Send a GET request to the search URL
$response = file_get_contents($searchUrl);

// Find the first search result link
preg_match('/<li><a href="([^"]+)">/', $response, $matches);

// Check if a link was found
if (isset($matches[1])) {
$docUrl = "https://www.php.net" . $matches[1];
return $docUrl;
} else {
return null;

// Example usage
$functionName = "strlen";
$docUrl = searchPHPFunction($functionName);

if ($docUrl) {
echo "Documentation URL: $docUrl";
} else {
echo "Function not found.";

In this code, the searchPHPFunction() function takes a function name as input, encodes it for the URL, and constructs the search URL for the PHP documentation website. It then sends a GET request to the search URL using file_get_contents() and searches for the first search result link using regular expressions.

If a link is found, the function returns the full documentation URL. Otherwise, it returns null to indicate that the function was not found.

You can replace the $functionName variable with the desired function name you want to search for. If the function is found, it will print the documentation URL. Otherwise, it will print "Function not found."

Please note that this code relies on the HTML structure of the PHP documentation website, which can change over time. Therefore, it may require adjustments if the website structure changes.