Q:

how to get multidimensional array inner key of same values in php at once?

I had an array $data_rows
            array(3) {
               [0]=>
                    array(3) {
                           ["ID"]=>
                            string(4) "C102"
                           ["FName"]=>
                            string(4) "John"
                           ["City"]=>
                            string(7) "Newyork"
                     }
               [1]=>
                    array(3) {
                           ["ID"]=>
                            string(4) "C104"
                           ["FName"]=>
                            string(6) "Ramesh"
                           ["City"]=>
                            string(6) "Mumbai"
                     }
               [2]=>
                    array(3) {
                           ["ID"]=>
                            string(4) "C105"
                           ["FName"]=>
                            string(6) "Yuwang"
                           ["City"]=>
                            string(7) "Beijing"
                     }
               }

I had tried with array_keys($data_rows), it gives only
0,1,2
What can i put to get all the inner keys only once i.e.
ID,FName,City

A:

Try this
print_r( array_keys( $data_rows[0] ) );

