PHP array_keys() Function

The array_keys() function is used to get all the keys or a subset of the keys of an array. It returns the keys, numeric and string, from the input array. This function was introduced in PHP 4.0.

Syntax

Parameter

Return Type

The array_keys( ) function returns an array containing the keys.

EXAMPLE 1

Output:

 Array ( [0] => virat [1] => sachin [2] => ganguly [3] => rahul ) 

EXAMPLE 2

Output:

 Array ( [0] => a [1] => b [2] => c ) 

EXAMPLE 3

Output:

 Array ( [0] => c ) 

EXAMPLE 4

Output:

 Array ( [0] => 3 )