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1.1     ! misho       1: --TEST--
        !             2: Test key() function : usage variations
        !             3: --FILE--
        !             4: <?php
        !             5: /* Prototype  : mixed key(array $array_arg)
        !             6:  * Description: Return the key of the element currently pointed to by the internal array pointer 
        !             7:  * Source code: ext/standard/array.c
        !             8:  */
        !             9: 
        !            10: /*
        !            11:  * Test how key() behaves with muti-dimensional and recursive arrays
        !            12:  */
        !            13: 
        !            14: echo "*** Testing key() : usage variations ***\n";
        !            15: 
        !            16: echo "\n-- Two Dimensional Array --\n";
        !            17: $multi_array = array ('zero', array (1, 2, 3), 'two');
        !            18: echo "Initial Position: ";
        !            19: var_dump(key($multi_array));
        !            20: 
        !            21: echo "Next Position:    ";
        !            22: next($multi_array);
        !            23: var_dump(key($multi_array));
        !            24: 
        !            25: echo "End Position:     ";
        !            26: end($multi_array);
        !            27: var_dump(key($multi_array));
        !            28: 
        !            29: echo "\n-- Access an Array Within an Array --\n";
        !            30: //accessing an array within an array
        !            31: echo "Initial Position: ";
        !            32: var_dump(key($multi_array[1]));
        !            33: 
        !            34: echo "\n-- Recursive, Multidimensional Array --\n";
        !            35: //create a recursive array
        !            36: $multi_array[] = &$multi_array;
        !            37: 
        !            38: //See where internal pointer is after adding more elements
        !            39: echo "Current Position: ";
        !            40: var_dump(key($multi_array));
        !            41: 
        !            42: //see if internal pointer is in same position as referenced array
        !            43: var_dump(key($multi_array[3][3][3]));
        !            44: // see if internal pointer is in the same position from when accessing this inner array
        !            45: var_dump(key($multi_array[3][3][3][1]));
        !            46: ?>
        !            47: ===DONE===
        !            48: --EXPECTF--
        !            49: *** Testing key() : usage variations ***
        !            50: 
        !            51: -- Two Dimensional Array --
        !            52: Initial Position: int(0)
        !            53: Next Position:    int(1)
        !            54: End Position:     int(2)
        !            55: 
        !            56: -- Access an Array Within an Array --
        !            57: Initial Position: int(0)
        !            58: 
        !            59: -- Recursive, Multidimensional Array --
        !            60: Current Position: int(2)
        !            61: int(2)
        !            62: int(0)
        !            63: ===DONE===