How Can I Retrieve Multiple Parameters with the Same Name from a URL in PHP?

Retrieving Multiple Parameters with the Same Name from a URL in PHP

When handling URLs containing multiple parameters with the same name, PHP's default behavior using $_GET only returns the last value assigned. To access all values for a given key, consider the following approach:

1. Parse the Query String: Use explode to split the query string into individual parameters.

$query = explode('&', $_SERVER['QUERY_STRING']);

2. Initialize an Array: Create an array to store the parameters.

$params = array();

3. Extract Parameter Name and Value: Iterate through the parameters and extract the name and value using explode.

foreach ($query as $param) {
  // Handle null value with '='
  if (strpos($param, '=') === false) $param += '=';

  list($name, $value) = explode('=', $param, 2);
}

4. Decode and Store in Array: Decode the extracted parameters and add them to the array, creating an array for parameters with multiple values.

  $params[urldecode($name)][] = urldecode($value);
}

Using this approach, you can access the multiple parameter values as follows:

print_r($params['rft_id']);
// Array ('info:oclcnum/1903126', 'http://www.biodiversitylibrary.org/bibliography/4323')

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