Definition

array keys(object $obj)

Returns an array containing the keys of the provided object. Note that, because JSON hashes are inherently unordered, the keys associated with $obj are inherently unordered.

Parameters

object $obj

Object to return the keys of.

Returns

array

Array of the keys of $obj.

Examples

{	
  a: keys({name: 'Juliet', age: `13`}),
  b: keys(`{}`),
  c: keys(`false`),            // Error
  d: keys(['b', 'a', 'c'])     // Error
}

{
  "a": [
    "name",
    "age"
  ],
  "b": []
}

Returns an array containing the keys of the provided object. Note that because JSON hashes are inherently unordered, the keys associated with the provided object obj are inherently unordered. Implementations are not required to return keys in any specific order.