PHP in_array通过键查找值

Question

I have an array like this:

$array = Array ( [0] => Array ( [id] => 6 ) [1] => Array ( [id] => 6 ) [2] => Array ( [id] => 123 ) [3] => Array ( [id] => 123 ) ) 

In a cycle I use the function

$id = 123;

if (in_array($id, $array)) {
   echo "found!!";
   }
   else
   {               
   echo "not found";
   }

But doesn't works; Why?

Answer 1

It will not work because $array contains array s as values. in_array alone will not help here. Use array_column & in_array together.

in_array($id, array_column($array, 'id'))

Answer 2

Just try

if (array_search($id,$a)) {
   echo "Found";
} else {
   echo "Not Found"
}