php 查找数组键名并输出值

$q ='www.111com.net';
$items = array(
"great bittern"=>"botaurus stellaris",
"little grebe"=>"tachybaptus ruficollis",
"black-necked grebe"=>"podiceps教程 nigricollis",
"little bittern"=>"ixobrychus minutus",
"black-crowned night heron"=>"www.111com.net",
"www.111com.net"=>"ardea purpurea",
"white stork"=>"ciconia ciconia",
"spoonbill"=>"platalea leucorodia",
"red-crested pochard"=>"netta rufina",
"common eider"=>"somateria mollissima",
"red kite"=>"milvus milvus",
"hen harrier"=>"circus cyaneus",
"heuglin's gull"=>"larus heuglini"
);
foreach ($items as $key=>$value) {
 if (strpos(strtolower($key), $q) !== false) {
  echo "$key|$value ";
 }
}

//结果为www.111com.net|ardea purpurea