php - How to set array key same as value -

i have question seems obvious can't reproduce yet. well, let's have array:

$array = ('apple', 'orange', 'banana');

so have same array same keys values, this:

array(     'apple' => 'apple',     'orange' => 'orange',     'banana' => 'banana' );

how that?

$array = array('first','second','third');  $newarray = array(); foreach($array $value) {     $newarray[$value] = $value; }

or initialize array wanted to:

$array = array(     'first' => 'first',     'second' => 'second' );

wiki

tL