Syntax:array array_keys ($input_array, $search_value, $strict)
Program 1:Program for getting the numeric index of an associative array using the array_keys() function.
// Program for printing the associative array index
// Declare an associative array
$assoc_array
=
array
(
" Geeks "
= > 10,
"for"
= > 15,
"engineer"
= > 20);
// Print the index with the corresponding key
// using the array_keys() function
print_r (
array_keys
(
$assoc_array
));
?>
Example 2:Below is the program uses the index to access the values in the associative array.
// Program for printing values using an index
// associative array
// Declare an associative array
$assoc_array
=
array
(
"Geeks"
= > 30,
"for"
= > 20,
"engineer"
= > 10
);
// Using the array_keys() function
$key
=
array_keys
(
$assoc_array
);
// Calculate array size
$size
= sizeof (
$key
);
// Using a loop to access values
for
(
$i
= 0;
$i
<
$size
;
$i
++) {
echo
"${assoc_array [$key [$i]]}"
;
}
?>