判斷PHP value： ``` <?php $data = array("FaceBook", "Google", "Yahoo"); if(in_array("FaceBook",$data)){ echo "找到"; } else { echo "沒找到"; } ``` 判斷PHP key： ``` <?php $a=array("Volvo"=>"XC90","BMW"=>"X5"); if (array_key_exists("Volvo",$a)) { echo "Key exists!"; } else { echo "Key does not exist!"; } ```