How to Retrieve Multiple URL Parameters with the Same Name in PHP?

Retrieving Multiple Parameters with Same Name from a URL in PHP

URLs often contain multiple parameters with the same name. For instance, an OpenURL resolver may encounter URLs with multiple "rft_id" parameters. However, PHP's $_GET only retrieves the last value for each parameter.

To address this, we can utilize the following code snippet:

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

foreach( $query as $param )
{
  // Prevent notice on explode() for missing '='
  if (strpos($param, '=') === false) $param += '=';

  list($name, $value) = explode('=', $param, 2);
  $params[urldecode($name)][] = urldecode($value);
}

This code will generate an array where each key is a parameter name and the corresponding value is an array of all values associated with that parameter.

In the provided OpenURL example:

// Sample URL
$url = 'ctx_ver=Z39.88-2004&rft_id=info:oclcnum/1903126&rft_id=http://www.biodiversitylibrary.org/bibliography/4323&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=book&rft.btitle=At last: a Christmas in the West Indies. &rft.place=London,&rft.pub=Macmillan and co.,&rft.aufirst=Charles&rft.aulast=Kingsley&rft.au=Kingsley, Charles,&rft.pages=1-352&rft.tpages=352&rft.date=1871';

$query  = explode('&', $url);
$params = array();

foreach( $query as $param )
{
  if (strpos($param, '=') === false) $param += '=';

  list($name, $value) = explode('=', $param, 2);
  $params[urldecode($name)][] = urldecode($value);
}

var_dump($params);

Will output:

array(
  'ctx_ver'     => array('Z39.88-2004'),
  'rft_id'      => array('info:oclcnum/1903126', 'http://www.biodiversitylibrary.org/bibliography/4323'),
  'rft_val_fmt' => array('info:ofi/fmt:kev:mtx:book'),
  'rft.genre'   => array('book'),
  'rft.btitle'  => array('At last: a Christmas in the West Indies.'),
  'rft.place'   => array('London'),
  'rft.pub'     => array('Macmillan and co.'),
  'rft.aufirst' => array('Charles'),
  'rft.aulast'  => array('Kingsley'),
  'rft.au'      => array('Kingsley, Charles'),
  'rft.pages'   => array('1-352'),
  'rft.tpages'  => array('352'),
  'rft.date'    => array('1871')
)

This solution provides a straightforward way to handle multiple parameters with the same name in PHP URLs.

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