How to extract a data from an array in php

Good people, well my little script for posts checks if it already exists, if yes it does not record, if not it writes to bd. I want to put a tanned system in it, so I created a table but for me to identify the post and I need the ID of the post .. So that's alright .. If you look at the "print_r ($ idcheck);" it returns an array with the id and the post, but I get to extract the id as a string, but for my lack of knowledge until I could not solve it ..

Array (     [0] = > Array         (             [id] = > 62             [content] = > jjjjjjjjjjjjjjjjjjj         ) ) I need only the id, but when I put echo $ idcheck ["id"] or idcheck [0] of the error ..         

        $status = 1;

        if( isset( $_POST['publicar'] ) ){

            date_default_timezone_set('America/Sao_Paulo');
            $form['data']       = date('Y-m-d H:i:s');
            $form['conteudo']   = str_replace( '\r\n', "\n", DBEscape( trim( $_POST['conteudo'] ) ));
            $form['status']     = DBEscape( strip_tags( trim( $status ) ) );
            if( empty( $form['conteudo'] ) )
                echo'';
            else {

                $dbCheck = DBRead( 'posts', "WHERE conteudo = '". $form['conteudo'] ."'" );

                if( $dbCheck )
                    echo '<script>alert("Desculpe, mas já contaram esse segredo!");</script>';
                else {

                    if( DBCreate( 'posts', $form ) ){
                        $idcheck = DBRead( 'posts', "WHERE conteudo = '". $form['conteudo'] ."'", 'id, conteudo');  
                        var_dump($idcheck);
                        echo '<pre>';
                        print_r($idcheck);
                        echo '</pre>';
                        //echo '<script>document.getElementById("myP").style.visibility = "visible";</script>';
                        echo '<script>alert("Seu segredo foi postado com sucesso!");</script>';
                    }
                    else
                        echo '<script>alert("Desculpe, ocorreu um erro...");</script>';
                }
            }

        }
?>