当有多种可能性时，查找数组中对象的索引

Question

I have an array, and I want to find all of the indexes of a certain object in the array. When I use array_search, it only returns the first index in which the object can be found.

echo array_search(3, array(3, 3, 4));

This returns 0, but I want to know that both indexes 0 and 1 have the integer 3 as their object. Is there a way of doing this without using a for loop?

Answer 1

Try array_keys() method :

  $array = array(3, 3, 4);
  print_r(array_keys($array, "3"));

For reference:

array_keys() — Return all the keys or a subset of the keys of an array Info & usuage examples : http://php.net/manual/en/function.array-keys.php