Why loop renders only last metabox from array? [closed]

Its because you are assigning your last array element to your class properties post_type,unicname,headline,fieldDisc

Since the input is an array you are overriding the class properties again and again, only last array element is saved there(post_type,unicname,headline,fieldDisc).

So what I would suggest is either store the whole array in one property or make each property an array so that they get room for holding multiple values

public function __construct( $array ) { 
global $post;
$this->metabox_array = $array;   
add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );
add_action( 'save_post', array( $this, 'save' ), 1, 2);    
}

//here a goes other methods that render and save metaboxes...
public function add_meta_box() {
   //looping over all input array
foreach ( $this->metabox_array as $metabox ) {

        add_meta_box(
            $metabox['unicname']
            ,$metabox['headline']
            ,array( $this, 'render_meta_box_content' )
            ,$metabox['post_type']
            ,'advanced'
            ,'high'
        );

   }

}

Your render_meta_box_content should have content accordingly, by looping over the array.

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