How to I return the key number I just added to an array in PHP by using [ ]? -

i have while loop, , in loop appending keys array using

$my_array[] = $array_element; 

code snippet:

<?php $raw_string = 'david,frank,hal9000,victor,jack,charles' $put_into_array = explode(',', $raw_string); $my_array = array(); foreach($put_into_array $array_element){     if($array_element != 'hal9000'){         $living_crew[] = $array_element;         if(  //the array key 2nd key//  ){              $lost_in_space_by = $tried_to_retrieve;              ////do here////         }         if(  //the array key 1st key//  ){              $tried_to_retrieve = //this key//;         }      } } ?> 

i looking way value added [] infront of $my_array. know particular example can solved in other ways, point learn function, not solve 1 example in other ways. expected behave similar now-depricated mysql_insert_id() function.

thanks!

use

$idx = array_push($living_crew, $xxx) - 1 

instead of

$living_crew[] = $xxx; 

it returns length of array. see http://php.net/manual/en/function.array-push.php