Process an expansion
array $matches Matches met in the preg_replace_callback:
string Returns the replacement string
private function expandMatch(array $matches) {
static $rfc1738to3986 = array(
'+' => '%20',
'%7e' => '~',
);
$parsed = self::parseExpression($matches[1]);
$replacements = array();
$prefix = $parsed['operator'];
$joiner = $parsed['operator'];
$useQueryString = false;
if ($parsed['operator'] == '?') {
$joiner = '&';
$useQueryString = true;
}
elseif ($parsed['operator'] == '&') {
$useQueryString = true;
}
elseif ($parsed['operator'] == '#') {
$joiner = ',';
}
elseif ($parsed['operator'] == ';') {
$useQueryString = true;
}
elseif ($parsed['operator'] == '' || $parsed['operator'] == '+') {
$joiner = ',';
$prefix = '';
}
foreach ($parsed['values'] as $value) {
if (!array_key_exists($value['value'], $this->variables) || $this->variables[$value['value']] === null) {
continue;
}
$variable = $this->variables[$value['value']];
$actuallyUseQueryString = $useQueryString;
$expanded = '';
if (is_array($variable)) {
$isAssoc = $this
->isAssoc($variable);
$kvp = array();
foreach ($variable as $key => $var) {
if ($isAssoc) {
$key = rawurlencode($key);
$isNestedArray = is_array($var);
}
else {
$isNestedArray = false;
}
if (!$isNestedArray) {
$var = rawurlencode($var);
if ($parsed['operator'] == '+' || $parsed['operator'] == '#') {
$var = $this
->decodeReserved($var);
}
}
if ($value['modifier'] == '*') {
if ($isAssoc) {
if ($isNestedArray) {
// Nested arrays must allow for deeply nested structures
$var = strtr(http_build_query(array(
$key => $var,
)), $rfc1738to3986);
}
else {
$var = $key . '=' . $var;
}
}
elseif ($key > 0 && $actuallyUseQueryString) {
$var = $value['value'] . '=' . $var;
}
}
$kvp[$key] = $var;
}
if (empty($variable)) {
$actuallyUseQueryString = false;
}
else {
if ($value['modifier'] == '*') {
$expanded = implode($joiner, $kvp);
if ($isAssoc) {
// Don't prepend the value name when using the explode modifier with an associative array
$actuallyUseQueryString = false;
}
}
else {
if ($isAssoc) {
// When an associative array is encountered and the explode modifier is not set, then the
// result must be a comma separated list of keys followed by their respective values.
foreach ($kvp as $k => &$v) {
$v = $k . ',' . $v;
}
}
$expanded = implode(',', $kvp);
}
}
}
else {
if ($value['modifier'] == ':') {
$variable = substr($variable, 0, $value['position']);
}
$expanded = rawurlencode($variable);
if ($parsed['operator'] == '+' || $parsed['operator'] == '#') {
$expanded = $this
->decodeReserved($expanded);
}
}
if ($actuallyUseQueryString) {
if (!$expanded && $joiner != '&') {
$expanded = $value['value'];
}
else {
$expanded = $value['value'] . '=' . $expanded;
}
}
$replacements[] = $expanded;
}
$ret = implode($joiner, $replacements);
if ($ret && $prefix) {
return $prefix . $ret;
}
return $ret;
}