How can I get parameters from a URL string?

user_295189 0
Viewed 640537

I have an HTML form field $_POST["url"], having some URL strings as the value.

Example values are:

https://example.com/test/1234?email=xyz@test.com
https://example.com/test/1234?basic=2&email=xyz2@test.com
https://example.com/test/1234?email=xyz3@test.com
https://example.com/test/1234?email=xyz4@test.com&testin=123
https://example.com/test/the-page-here/1234?someurl=key&email=xyz5@test.com

etc.

How can I get only the email parameter from these URLs/values?

Please note that I am not getting these strings from the browser address bar.

url-parsing php
12 Answers

As mentioned in another answer, the best solution is using parse_url().

You need to use a combination of parse_url() and parse_str().

The parse_url() parses the URL and return its components that you can get the query string using the query key. Then you should use parse_str() that parses the query string and returns values into a variable.

$url = "https://example.com/test/1234?basic=2&email=xyz2@test.com";
parse_str(parse_url($url)['query'], $params);
echo $params['email']; // xyz2@test.com

Also you can do this work using regex: preg_match()

You can use preg_match() to get a specific value of the query string from a URL.

preg_match("/&?email=([^&]+)/", $url, $matches);
echo $matches[1]; // xyz2@test.com

preg_replace()

Also you can use preg_replace() to do this work in one line!

$email = preg_replace("/^https?:\/\/.*\?.*email=([^&]+).*$/", "$1", $url);
// xyz2@test.com
user_51047480 
$web_url = 'http://www.writephponline.com?name=shubham&email=singh@gmail.com';
$query = parse_url($web_url, PHP_URL_QUERY);
parse_str($query, $queryArray);

echo "Name: " . $queryArray['name'];  // Result: shubham
echo "EMail: " . $queryArray['email']; // Result:singh@gmail.com
user_83163000

A much more secure answer that I'm surprised is not mentioned here yet:

filter_input

So in the case of the question you can use this to get an email value from the URL get parameters:

$email = filter_input( INPUT_GET, 'email', FILTER_SANITIZE_EMAIL );

For other types of variables, you would want to choose a different/appropriate filter such as FILTER_SANITIZE_STRING.

I suppose this answer does more than exactly what the question asks for - getting the raw data from the URL parameter. But this is a one-line shortcut that is the same result as this:

$email = $_GET['email'];
$email = filter_var( $email, FILTER_SANITIZE_EMAIL );

Might as well get into the habit of grabbing variables this way.

user_9473700

In Laravel, I'm using:

private function getValueFromString(string $string, string $key)
{
    parse_str(parse_url($string, PHP_URL_QUERY), $result);

    return isset($result[$key]) ? $result[$key] : null;
}
user_26629460

A dynamic function which parses string URL and gets the value of the query parameter passed in the URL:

function getParamFromUrl($url, $paramName){
  parse_str(parse_url($url, PHP_URL_QUERY), $op); // Fetch query parameters from a string and convert to an associative array
  return array_key_exists($paramName, $op) ? $op[$paramName] : "Not Found"; // Check if the key exists in this array
}

Call the function to get a result:

echo getParamFromUrl('https://google.co.in?name=james&surname=bond', 'surname'); // "bond" will be output here
user_67404740
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