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]]}" ; }
?>
