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$post_title = "This Awesome Title";
$post_content = "My content of something cool.";
$post_status = "publish"; //publish, draft, etc
$post_type = "page"; // or whatever post type desired

/* Attempt to find post id by post name if it exists */
$found_post_title = get_page_by_title( $post_title, OBJECT, $post_type );
$found_post_id = $found_post_title->ID;

/**********************************************************
** Check If Page does not exist, if true, create a new post 
************************************************************/
if ( FALSE === get_post_status( $found_post_id ) ): 

      $post_args = array(
        \'post_title\' => $post_title,
        \'post_type\' => $post_type,
        \'post_content\'=> $post_content,
        \'post_status\'  => $post_status,
        //\'post_author\'  => get_current_user_id(),

        /* If you have meta fields to enter data into */ 
        \'meta_input\'   => array(
            \'meta_key1\' => \'my value\',
            \'meta_key2\' => \'my other value\',
        ),
      );      


      /* Add a new wp post into db, return it\'s post id */
      $returned_post_id = wp_insert_post( $post_args );  

      /* Update page template only if using "page" as the post_type */ 
      update_post_meta( $returned_post_id, \'_wp_page_template\', \'my-page-template.php\' ); 

      /* Add values into meta fields. Work with ACF CUSTOM FIELDS!! */
      $field_key = "My_Field_KEY";
      $value = "my custom value";
      update_field( $field_key, $value, $returned_post_id );

      $field_key = "My_Other_Field_KEY";
      $value = "my other custom value";
      update_field( $field_key, $value, $returned_post_id );

      /* Save a checkbox or select value */
      // $field_key = "My_Field_KEY";
      // $value = array("red", "blue", "yellow");
      // update_field( $field_key, $value, $returned_post_id );

      /* Save to a repeater field value */
      // $field_key = "My_Field_KEY";
      // $value = array(
      //   array(
      //     "ss_name" => "Foo",
      //     "ss_type" => "Bar"
      //   )
      // );
      // update_field( $field_key, $value, $returned_post_id );

      /* Echo a response! */
      echo "<span class=\'pg-new\'><strong>". $post_title . " Created!</strong></span><br>";
      echo "<a href=\'".esc_url( get_permalink($returned_post_id) )."\' target=\'_Blank\'>". $post_title . "</a><p>";


else:        
/***************************
** IF POST EXISTS, update it 
****************************/

      /* Update post */
      $update_post_args = array(
        \'ID\'           => $found_post_id,
        \'post_title\'   => $post_title,
        \'post_content\' => $post_content,
      );

      /* Update the post into the database */
      wp_update_post( $update_post_args );

      /* Update values into meta fields */
      $field_key = "My_Field_KEY";
      $value = "my custom value";
      update_field( $field_key, $value, $found_post_id );

      $field_key = "My_Other_Field_KEY";
      $value = "my other custom value";
      update_field( $field_key, $value, $found_post_id );

      /* Echo a response! */
      echo "<span class=\'pg-update\'><strong>". $post_title . " Updated!</strong></span><br>"; 
      echo "<a href=\'".esc_url( get_permalink($found_post_id) )."\' target=\'_Blank\'>View</a> | <a href=\'post.php?post=".$found_post_id."&action=edit\'>". $post_title . "</a><p>";

endif;